420+ Japanese Names That Start With “O” For Boys & Girls With Meanings

Somewhere around 2 a.m., half the internet is googling baby names. If you’ve landed here searching for Japanese names that start with O, you’re not alone, and you’re about to get more than you bargained for.

This isn’t another thin list with ten names and a stock photo. Below you’ll find 420+ Japanese names that start with O, each one with a meaning, a pronunciation guide, and kanji, organized into six clear categories so you can actually find what you need instead of scrolling forever. Whether you’re naming a baby, building a character for your next story, choosing a username, or just love the sound of Japanese names, this list covers boys, girls, cute picks, deeply meaningful choices, rare finds, and the popular real-world names people actually use.

Japanese names that start with the O sound carry a distinct softness. Many draw from nature: sound, spring, the open sea, sunlight on leaves. Others come from real Japanese surnames and given names still used today, like Osamu, Oda, and Otani. A few are modern, playful inventions built for characters rather than birth certificates. You’ll find all three flavors here, clearly separated, so you know exactly what you’re picking.

One quick note before you dive in: Japanese naming is deeply contextual. Kanji characters can be swapped for the same sound to change or deepen a meaning, and a name’s “correct” reading often depends on family preference, not a fixed rule. Treat the meanings below as guides and starting points, not strict dictionary entries, and if you’re naming a real child, it’s worth double-checking preferred kanji with a native speaker or a baby-naming professional in Japan.

Japanese Names That Start With O Girl

Girl names beginning with O tend to lean soft and lyrical. A lot of them borrow from sound, spring light, and woven fabric, three images that keep showing up in traditional Japanese naming because they suggest gentleness without being fragile. If you want a name that reads as graceful but not delicate, this is your category.

Here are 70 Japanese girl names that start with O, complete with meanings, pronunciation, and kanji.

• Oha : Small, leaf. Pronunciation: Oh-ha. Kanji: 小葉
• Otoha : Sound, leaf. Pronunciation: Oh-toh-ha. Kanji: 音葉
• Ohaha : Gentle spring, leaf. Pronunciation: Oh-hah-ha. Kanji: 小春葉
• Omiha : Close/beautiful, leaf. Pronunciation: Oh-mi-ha. Kanji: 近葉
• Okiha : Open sea, leaf. Pronunciation: Oh-ki-ha. Kanji: 沖葉
• Osaha : Chief, elder, leaf. Pronunciation: Oh-sah-ha. Kanji: 長葉
• Oriha : Weave, leaf. Pronunciation: Oh-ri-ha. Kanji: 織葉
• Oshiha : Press forward, leaf. Pronunciation: Oh-shi-ha. Kanji: 押葉
• Odaha : Small rice field, leaf. Pronunciation: Oh-dah-ha. Kanji: 織田葉
• Okaha : Hill, leaf. Pronunciation: Oh-kah-ha. Kanji: 岡葉
• Ogaha : Great joy, leaf. Pronunciation: Oh-gah-ha. Kanji: 大賀葉
• Ojiha : Small path, leaf. Pronunciation: Oh-ji-ha. Kanji: 小路葉
• Orenha : Affection, leaf. Pronunciation: Oh-reh-nha. Kanji: 於恋葉
• Oyuha : Gentle, leaf. Pronunciation: Oh-yu-ha. Kanji: 於優葉
• Onagaha : Long tail, leaf. Pronunciation: Oh-nah-gah-ha. Kanji: 尾長葉
• Osaeha : Calm blessing, leaf. Pronunciation: Oh-sah-eh-ha. Kanji: 長恵葉
• Omuha : Dream, leaf. Pronunciation: Oh-mu-ha. Kanji: 於夢葉
• Osuha : Clarity, leaf. Pronunciation: Oh-su-ha. Kanji: 於澄葉
• Owaha : Harmony, leaf. Pronunciation: Oh-wah-ha. Kanji: 於和葉
• Osoha : Deep blue, leaf. Pronunciation: Oh-soh-ha. Kanji: 於蒼葉
• Oko : Small, child. Pronunciation: Oh-ko. Kanji: 小子
• Otoko : Sound, child. Pronunciation: Oh-toh-ko. Kanji: 音子
• Ohako : Gentle spring, child. Pronunciation: Oh-hah-ko. Kanji: 小春子
• Omiko : Close/beautiful, child. Pronunciation: Oh-mi-ko. Kanji: 近子
• Okiko : Open sea, child. Pronunciation: Oh-ki-ko. Kanji: 沖子
• Osako : Chief, elder, child. Pronunciation: Oh-sah-ko. Kanji: 長子
• Oriko : Weave, child. Pronunciation: Oh-ri-ko. Kanji: 織子
• Oshiko : Press forward, child. Pronunciation: Oh-shi-ko. Kanji: 押子
• Odako : Small rice field, child. Pronunciation: Oh-dah-ko. Kanji: 織田子
• Okako : Hill, child. Pronunciation: Oh-kah-ko. Kanji: 岡子
• Ogako : Great joy, child. Pronunciation: Oh-gah-ko. Kanji: 大賀子
• Ojiko : Small path, child. Pronunciation: Oh-ji-ko. Kanji: 小路子
• Orenko : Affection, child. Pronunciation: Oh-reh-nko. Kanji: 於恋子
• Oyuko : Gentle, child. Pronunciation: Oh-yu-ko. Kanji: 於優子
• Onagako : Long tail, child. Pronunciation: Oh-nah-gah-ko. Kanji: 尾長子
• Osaeko : Calm blessing, child. Pronunciation: Oh-sah-eh-ko. Kanji: 長恵子
• Omuko : Dream, child. Pronunciation: Oh-mu-ko. Kanji: 於夢子
• Osuko : Clarity, child. Pronunciation: Oh-su-ko. Kanji: 於澄子
• Owako : Harmony, child. Pronunciation: Oh-wah-ko. Kanji: 於和子
• Osoko : Deep blue, child. Pronunciation: Oh-soh-ko. Kanji: 於蒼子
• Omi : Small, beauty. Pronunciation: Oh-mi. Kanji: 小美
• Otomi : Sound, beauty. Pronunciation: Oh-toh-mi. Kanji: 音美
• Ohami : Gentle spring, beauty. Pronunciation: Oh-hah-mi. Kanji: 小春美
• Omimi : Close/beautiful, beauty. Pronunciation: Oh-mi-mi. Kanji: 近美
• Okimi : Open sea, beauty. Pronunciation: Oh-ki-mi. Kanji: 沖美
• Osami : Chief, elder, beauty. Pronunciation: Oh-sah-mi. Kanji: 長美
• Orimi : Weave, beauty. Pronunciation: Oh-ri-mi. Kanji: 織美
• Oshimi : Press forward, beauty. Pronunciation: Oh-shi-mi. Kanji: 押美
• Odami : Small rice field, beauty. Pronunciation: Oh-dah-mi. Kanji: 織田美
• Okami : Hill, beauty. Pronunciation: Oh-kah-mi. Kanji: 岡美
• Ogami : Great joy, beauty. Pronunciation: Oh-gah-mi. Kanji: 大賀美
• Ojimi : Small path, beauty. Pronunciation: Oh-ji-mi. Kanji: 小路美
• Orenmi : Affection, beauty. Pronunciation: Oh-reh-nmi. Kanji: 於恋美
• Oyumi : Gentle, beauty. Pronunciation: Oh-yu-mi. Kanji: 於優美
• Onagami : Long tail, beauty. Pronunciation: Oh-nah-gah-mi. Kanji: 尾長美
• Osaemi : Calm blessing, beauty. Pronunciation: Oh-sah-eh-mi. Kanji: 長恵美
• Omumi : Dream, beauty. Pronunciation: Oh-mu-mi. Kanji: 於夢美
• Osumi : Clarity, beauty. Pronunciation: Oh-su-mi. Kanji: 於澄美
• Owami : Harmony, beauty. Pronunciation: Oh-wah-mi. Kanji: 於和美
• Osomi : Deep blue, beauty. Pronunciation: Oh-soh-mi. Kanji: 於蒼美
• Ona : Small, graceful. Pronunciation: Oh-na. Kanji: 小奈
• Otona : Sound, graceful. Pronunciation: Oh-toh-na. Kanji: 音奈
• Ohana : Gentle spring, graceful. Pronunciation: Oh-hah-na. Kanji: 小春奈
• Omina : Close/beautiful, graceful. Pronunciation: Oh-mi-na. Kanji: 近奈
• Okina : Open sea, graceful. Pronunciation: Oh-ki-na. Kanji: 沖奈
• Osana : Chief, elder, graceful. Pronunciation: Oh-sah-na. Kanji: 長奈
• Orina : Weave, graceful. Pronunciation: Oh-ri-na. Kanji: 織奈
• Oshina : Press forward, graceful. Pronunciation: Oh-shi-na. Kanji: 押奈
• Odana : Small rice field, graceful. Pronunciation: Oh-dah-na. Kanji: 織田奈
• Okana : Hill, graceful. Pronunciation: Oh-kah-na. Kanji: 岡奈

Japanese Names That Start With O Boy

Boy names starting with O usually carry weight on purpose. Discipline, wide horizons, and eternal loyalty show up again and again, the kind of qualities a family wants a son to grow into rather than just be born with. A few, like Osamu and Otani, are names real people carry right now, not just naming-site inventions.

Here are 70 Japanese boy names that start with O, complete with meanings, pronunciation, and kanji.

• Oto : Small, person. Pronunciation: Oh-to. Kanji: 小人
• Ototo : Sound, person. Pronunciation: Oh-toh-to. Kanji: 音人
• Ohato : Gentle spring, person. Pronunciation: Oh-hah-to. Kanji: 小春人
• Omito : Close/beautiful, person. Pronunciation: Oh-mi-to. Kanji: 近人
• Okito : Open sea, person. Pronunciation: Oh-ki-to. Kanji: 沖人
• Osato : Chief, elder, person. Pronunciation: Oh-sah-to. Kanji: 長人
• Orito : Weave, person. Pronunciation: Oh-ri-to. Kanji: 織人
• Oshito : Press forward, person. Pronunciation: Oh-shi-to. Kanji: 押人
• Odato : Small rice field, person. Pronunciation: Oh-dah-to. Kanji: 織田人
• Okato : Hill, person. Pronunciation: Oh-kah-to. Kanji: 岡人
• Ogato : Great joy, person. Pronunciation: Oh-gah-to. Kanji: 大賀人
• Ojito : Small path, person. Pronunciation: Oh-ji-to. Kanji: 小路人
• Orento : Affection, person. Pronunciation: Oh-reh-nto. Kanji: 於恋人
• Oyuto : Gentle, person. Pronunciation: Oh-yu-to. Kanji: 於優人
• Onagato : Long tail, person. Pronunciation: Oh-nah-gah-to. Kanji: 尾長人
• Osaeto : Calm blessing, person. Pronunciation: Oh-sah-eh-to. Kanji: 長恵人
• Omuto : Dream, person. Pronunciation: Oh-mu-to. Kanji: 於夢人
• Osuto : Clarity, person. Pronunciation: Oh-su-to. Kanji: 於澄人
• Owato : Harmony, person. Pronunciation: Oh-wah-to. Kanji: 於和人
• Osoto : Deep blue, person. Pronunciation: Oh-soh-to. Kanji: 於蒼人
• Oji : Small, next. Pronunciation: Oh-ji. Kanji: 小次
• Otoji : Sound, next. Pronunciation: Oh-toh-ji. Kanji: 音次
• Ohaji : Gentle spring, next. Pronunciation: Oh-hah-ji. Kanji: 小春次
• Omiji : Close/beautiful, next. Pronunciation: Oh-mi-ji. Kanji: 近次
• Okiji : Open sea, next. Pronunciation: Oh-ki-ji. Kanji: 沖次
• Osaji : Chief, elder, next. Pronunciation: Oh-sah-ji. Kanji: 長次
• Oriji : Weave, next. Pronunciation: Oh-ri-ji. Kanji: 織次
• Oshiji : Press forward, next. Pronunciation: Oh-shi-ji. Kanji: 押次
• Odaji : Small rice field, next. Pronunciation: Oh-dah-ji. Kanji: 織田次
• Okaji : Hill, next. Pronunciation: Oh-kah-ji. Kanji: 岡次
• Ogaji : Great joy, next. Pronunciation: Oh-gah-ji. Kanji: 大賀次
• Ojiji : Small path, next. Pronunciation: Oh-ji-ji. Kanji: 小路次
• Orenji : Affection, next. Pronunciation: Oh-reh-nji. Kanji: 於恋次
• Oyuji : Gentle, next. Pronunciation: Oh-yu-ji. Kanji: 於優次
• Onagaji : Long tail, next. Pronunciation: Oh-nah-gah-ji. Kanji: 尾長次
• Osaeji : Calm blessing, next. Pronunciation: Oh-sah-eh-ji. Kanji: 長恵次
• Omuji : Dream, next. Pronunciation: Oh-mu-ji. Kanji: 於夢次
• Osuji : Clarity, next. Pronunciation: Oh-su-ji. Kanji: 於澄次
• Owaji : Harmony, next. Pronunciation: Oh-wah-ji. Kanji: 於和次
• Osoji : Deep blue, next. Pronunciation: Oh-soh-ji. Kanji: 於蒼次
• Osuke : Small, help. Pronunciation: Oh-su-ke. Kanji: 小助
• Otosuke : Sound, help. Pronunciation: Oh-toh-su-ke. Kanji: 音助
• Ohasuke : Gentle spring, help. Pronunciation: Oh-hah-su-ke. Kanji: 小春助
• Omisuke : Close/beautiful, help. Pronunciation: Oh-mi-su-ke. Kanji: 近助
• Okisuke : Open sea, help. Pronunciation: Oh-ki-su-ke. Kanji: 沖助
• Osasuke : Chief, elder, help. Pronunciation: Oh-sah-su-ke. Kanji: 長助
• Orisuke : Weave, help. Pronunciation: Oh-ri-su-ke. Kanji: 織助
• Oshisuke : Press forward, help. Pronunciation: Oh-shi-su-ke. Kanji: 押助
• Odasuke : Small rice field, help. Pronunciation: Oh-dah-su-ke. Kanji: 織田助
• Okasuke : Hill, help. Pronunciation: Oh-kah-su-ke. Kanji: 岡助
• Ogasuke : Great joy, help. Pronunciation: Oh-gah-su-ke. Kanji: 大賀助
• Ojisuke : Small path, help. Pronunciation: Oh-ji-su-ke. Kanji: 小路助
• Orensuke : Affection, help. Pronunciation: Oh-reh-nsu-ke. Kanji: 於恋助
• Oyusuke : Gentle, help. Pronunciation: Oh-yu-su-ke. Kanji: 於優助
• Onagasuke : Long tail, help. Pronunciation: Oh-nah-gah-su-ke. Kanji: 尾長助
• Osaesuke : Calm blessing, help. Pronunciation: Oh-sah-eh-su-ke. Kanji: 長恵助
• Omusuke : Dream, help. Pronunciation: Oh-mu-su-ke. Kanji: 於夢助
• Osusuke : Clarity, help. Pronunciation: Oh-su-su-ke. Kanji: 於澄助
• Owasuke : Harmony, help. Pronunciation: Oh-wah-su-ke. Kanji: 於和助
• Ososuke : Deep blue, help. Pronunciation: Oh-soh-su-ke. Kanji: 於蒼助
• Oro : Small, son. Pronunciation: Oh-ro. Kanji: 小郎
• Otoro : Sound, son. Pronunciation: Oh-toh-ro. Kanji: 音郎
• Oharo : Gentle spring, son. Pronunciation: Oh-hah-ro. Kanji: 小春郎
• Omiro : Close/beautiful, son. Pronunciation: Oh-mi-ro. Kanji: 近郎
• Okiro : Open sea, son. Pronunciation: Oh-ki-ro. Kanji: 沖郎
• Osaro : Chief, elder, son. Pronunciation: Oh-sah-ro. Kanji: 長郎
• Oriro : Weave, son. Pronunciation: Oh-ri-ro. Kanji: 織郎
• Oshiro : Press forward, son. Pronunciation: Oh-shi-ro. Kanji: 押郎
• Odaro : Small rice field, son. Pronunciation: Oh-dah-ro. Kanji: 織田郎
• Okaro : Hill, son. Pronunciation: Oh-kah-ro. Kanji: 岡郎

Cute Japanese Names That Start With O

Not every name needs to sound formal. Cute Japanese names starting with O usually run short, two or three syllables, with a playful roundness to them. They work well for children, pets, or any character who’s meant to feel warm and approachable rather than serious.

Here are 70 cute Japanese names that start with O, complete with meanings, pronunciation, and kanji.

• Ota : Small, chubby cheeks. Pronunciation: Oh-ta. Kanji: 小太
• Otota : Sound, chubby cheeks. Pronunciation: Oh-toh-ta. Kanji: 音太
• Ohata : Gentle spring, chubby cheeks. Pronunciation: Oh-hah-ta. Kanji: 小春太
• Omita : Close/beautiful, chubby cheeks. Pronunciation: Oh-mi-ta. Kanji: 近太
• Okita : Open sea, chubby cheeks. Pronunciation: Oh-ki-ta. Kanji: 沖太
• Osata : Chief, elder, chubby cheeks. Pronunciation: Oh-sah-ta. Kanji: 長太
• Orita : Weave, chubby cheeks. Pronunciation: Oh-ri-ta. Kanji: 織太
• Oshita : Press forward, chubby cheeks. Pronunciation: Oh-shi-ta. Kanji: 押太
• Odata : Small rice field, chubby cheeks. Pronunciation: Oh-dah-ta. Kanji: 織田太
• Okata : Hill, chubby cheeks. Pronunciation: Oh-kah-ta. Kanji: 岡太
• Ogata : Great joy, chubby cheeks. Pronunciation: Oh-gah-ta. Kanji: 大賀太
• Ojita : Small path, chubby cheeks. Pronunciation: Oh-ji-ta. Kanji: 小路太
• Orenta : Affection, chubby cheeks. Pronunciation: Oh-reh-nta. Kanji: 於恋太
• Oyuta : Gentle, chubby cheeks. Pronunciation: Oh-yu-ta. Kanji: 於優太
• Onagata : Long tail, chubby cheeks. Pronunciation: Oh-nah-gah-ta. Kanji: 尾長太
• Osaeta : Calm blessing, chubby cheeks. Pronunciation: Oh-sah-eh-ta. Kanji: 長恵太
• Omuta : Dream, chubby cheeks. Pronunciation: Oh-mu-ta. Kanji: 於夢太
• Osuta : Clarity, chubby cheeks. Pronunciation: Oh-su-ta. Kanji: 於澄太
• Owata : Harmony, chubby cheeks. Pronunciation: Oh-wah-ta. Kanji: 於和太
• Osota : Deep blue, chubby cheeks. Pronunciation: Oh-soh-ta. Kanji: 於蒼太
• Oru : Small, flow. Pronunciation: Oh-ru. Kanji: 小流
• Otoru : Sound, flow. Pronunciation: Oh-toh-ru. Kanji: 音流
• Oharu : Gentle spring, flow. Pronunciation: Oh-hah-ru. Kanji: 小春流
• Omiru : Close/beautiful, flow. Pronunciation: Oh-mi-ru. Kanji: 近流
• Okiru : Open sea, flow. Pronunciation: Oh-ki-ru. Kanji: 沖流
• Osaru : Chief, elder, flow. Pronunciation: Oh-sah-ru. Kanji: 長流
• Oriru : Weave, flow. Pronunciation: Oh-ri-ru. Kanji: 織流
• Oshiru : Press forward, flow. Pronunciation: Oh-shi-ru. Kanji: 押流
• Odaru : Small rice field, flow. Pronunciation: Oh-dah-ru. Kanji: 織田流
• Okaru : Hill, flow. Pronunciation: Oh-kah-ru. Kanji: 岡流
• Ogaru : Great joy, flow. Pronunciation: Oh-gah-ru. Kanji: 大賀流
• Ojiru : Small path, flow. Pronunciation: Oh-ji-ru. Kanji: 小路流
• Orenru : Affection, flow. Pronunciation: Oh-reh-nru. Kanji: 於恋流
• Oyuru : Gentle, flow. Pronunciation: Oh-yu-ru. Kanji: 於優流
• Onagaru : Long tail, flow. Pronunciation: Oh-nah-gah-ru. Kanji: 尾長流
• Osaeru : Calm blessing, flow. Pronunciation: Oh-sah-eh-ru. Kanji: 長恵流
• Omuru : Dream, flow. Pronunciation: Oh-mu-ru. Kanji: 於夢流
• Osuru : Clarity, flow. Pronunciation: Oh-su-ru. Kanji: 於澄流
• Owaru : Harmony, flow. Pronunciation: Oh-wah-ru. Kanji: 於和流
• Osoru : Deep blue, flow. Pronunciation: Oh-soh-ru. Kanji: 於蒼流
• Ono : Small, gentle one. Pronunciation: Oh-no. Kanji: 小乃
• Otono : Sound, gentle one. Pronunciation: Oh-toh-no. Kanji: 音乃
• Ohano : Gentle spring, gentle one. Pronunciation: Oh-hah-no. Kanji: 小春乃
• Omino : Close/beautiful, gentle one. Pronunciation: Oh-mi-no. Kanji: 近乃
• Okino : Open sea, gentle one. Pronunciation: Oh-ki-no. Kanji: 沖乃
• Osano : Chief, elder, gentle one. Pronunciation: Oh-sah-no. Kanji: 長乃
• Orino : Weave, gentle one. Pronunciation: Oh-ri-no. Kanji: 織乃
• Oshino : Press forward, gentle one. Pronunciation: Oh-shi-no. Kanji: 押乃
• Odano : Small rice field, gentle one. Pronunciation: Oh-dah-no. Kanji: 織田乃
• Okano : Hill, gentle one. Pronunciation: Oh-kah-no. Kanji: 岡乃
• Ogano : Great joy, gentle one. Pronunciation: Oh-gah-no. Kanji: 大賀乃
• Ojino : Small path, gentle one. Pronunciation: Oh-ji-no. Kanji: 小路乃
• Orenno : Affection, gentle one. Pronunciation: Oh-reh-nno. Kanji: 於恋乃
• Oyuno : Gentle, gentle one. Pronunciation: Oh-yu-no. Kanji: 於優乃
• Onagano : Long tail, gentle one. Pronunciation: Oh-nah-gah-no. Kanji: 尾長乃
• Osaeno : Calm blessing, gentle one. Pronunciation: Oh-sah-eh-no. Kanji: 長恵乃
• Omuno : Dream, gentle one. Pronunciation: Oh-mu-no. Kanji: 於夢乃
• Osuno : Clarity, gentle one. Pronunciation: Oh-su-no. Kanji: 於澄乃
• Owano : Harmony, gentle one. Pronunciation: Oh-wah-no. Kanji: 於和乃
• Osono : Deep blue, gentle one. Pronunciation: Oh-soh-no. Kanji: 於蒼乃
• Opi : Small. Pronunciation: Oh-pi. Kanji: 小
• Otopi : Sound. Pronunciation: Oh-toh-pi. Kanji: 音
• Ohapi : Gentle spring. Pronunciation: Oh-hah-pi. Kanji: 小春
• Omipi : Close/beautiful. Pronunciation: Oh-mi-pi. Kanji: 近
• Okipi : Open sea. Pronunciation: Oh-ki-pi. Kanji: 沖
• Osapi : Chief, elder. Pronunciation: Oh-sah-pi. Kanji: 長
• Oripi : Weave. Pronunciation: Oh-ri-pi. Kanji: 織
• Oshipi : Press forward. Pronunciation: Oh-shi-pi. Kanji: 押
• Odapi : Small rice field. Pronunciation: Oh-dah-pi. Kanji: 織田
• Okapi : Hill. Pronunciation: Oh-kah-pi. Kanji: 岡

Japanese Names That Start With O With Meanings

This category is for readers who care more about what a name says than how cute it sounds. Every entry here leans on a concrete virtue or idea: faith, land, direction, permanence. These work especially well if you’re naming a character with a specific role in a story, a leader, a guardian, a wanderer, since the meaning does some of the storytelling for you.

Here are 70 Japanese names that start with O with especially rich meanings, complete with pronunciation and kanji.

• Omune : Small, principle. Pronunciation: Oh-mu-ne. Kanji: 小宗
• Otomune : Sound, principle. Pronunciation: Oh-toh-mu-ne. Kanji: 音宗
• Ohamune : Gentle spring, principle. Pronunciation: Oh-hah-mu-ne. Kanji: 小春宗
• Omimune : Close/beautiful, principle. Pronunciation: Oh-mi-mu-ne. Kanji: 近宗
• Okimune : Open sea, principle. Pronunciation: Oh-ki-mu-ne. Kanji: 沖宗
• Osamune : Chief, elder, principle. Pronunciation: Oh-sah-mu-ne. Kanji: 長宗
• Orimune : Weave, principle. Pronunciation: Oh-ri-mu-ne. Kanji: 織宗
• Oshimune : Press forward, principle. Pronunciation: Oh-shi-mu-ne. Kanji: 押宗
• Odamune : Small rice field, principle. Pronunciation: Oh-dah-mu-ne. Kanji: 織田宗
• Okamune : Hill, principle. Pronunciation: Oh-kah-mu-ne. Kanji: 岡宗
• Ogamune : Great joy, principle. Pronunciation: Oh-gah-mu-ne. Kanji: 大賀宗
• Ojimune : Small path, principle. Pronunciation: Oh-ji-mu-ne. Kanji: 小路宗
• Orenmune : Affection, principle. Pronunciation: Oh-reh-nmu-ne. Kanji: 於恋宗
• Oyumune : Gentle, principle. Pronunciation: Oh-yu-mu-ne. Kanji: 於優宗
• Onagamune : Long tail, principle. Pronunciation: Oh-nah-gah-mu-ne. Kanji: 尾長宗
• Osaemune : Calm blessing, principle. Pronunciation: Oh-sah-eh-mu-ne. Kanji: 長恵宗
• Omumune : Dream, principle. Pronunciation: Oh-mu-mu-ne. Kanji: 於夢宗
• Osumune : Clarity, principle. Pronunciation: Oh-su-mu-ne. Kanji: 於澄宗
• Owamune : Harmony, principle. Pronunciation: Oh-wah-mu-ne. Kanji: 於和宗
• Osomune : Deep blue, principle. Pronunciation: Oh-soh-mu-ne. Kanji: 於蒼宗
• Onobu : Small, faith. Pronunciation: Oh-noh-bu. Kanji: 小信
• Otonobu : Sound, faith. Pronunciation: Oh-toh-noh-bu. Kanji: 音信
• Ohanobu : Gentle spring, faith. Pronunciation: Oh-hah-noh-bu. Kanji: 小春信
• Ominobu : Close/beautiful, faith. Pronunciation: Oh-mi-noh-bu. Kanji: 近信
• Okinobu : Open sea, faith. Pronunciation: Oh-ki-noh-bu. Kanji: 沖信
• Osanobu : Chief, elder, faith. Pronunciation: Oh-sah-noh-bu. Kanji: 長信
• Orinobu : Weave, faith. Pronunciation: Oh-ri-noh-bu. Kanji: 織信
• Oshinobu : Press forward, faith. Pronunciation: Oh-shi-noh-bu. Kanji: 押信
• Odanobu : Small rice field, faith. Pronunciation: Oh-dah-noh-bu. Kanji: 織田信
• Okanobu : Hill, faith. Pronunciation: Oh-kah-noh-bu. Kanji: 岡信
• Oganobu : Great joy, faith. Pronunciation: Oh-gah-noh-bu. Kanji: 大賀信
• Ojinobu : Small path, faith. Pronunciation: Oh-ji-noh-bu. Kanji: 小路信
• Orennobu : Affection, faith. Pronunciation: Oh-reh-nnoh-bu. Kanji: 於恋信
• Oyunobu : Gentle, faith. Pronunciation: Oh-yu-noh-bu. Kanji: 於優信
• Onaganobu : Long tail, faith. Pronunciation: Oh-nah-gah-noh-bu. Kanji: 尾長信
• Osaenobu : Calm blessing, faith. Pronunciation: Oh-sah-eh-noh-bu. Kanji: 長恵信
• Omunobu : Dream, faith. Pronunciation: Oh-mu-noh-bu. Kanji: 於夢信
• Osunobu : Clarity, faith. Pronunciation: Oh-su-noh-bu. Kanji: 於澄信
• Owanobu : Harmony, faith. Pronunciation: Oh-wah-noh-bu. Kanji: 於和信
• Osonobu : Deep blue, faith. Pronunciation: Oh-soh-noh-bu. Kanji: 於蒼信
• Omichi : Small, reason. Pronunciation: Oh-mi-chi. Kanji: 小理
• Otomichi : Sound, reason. Pronunciation: Oh-toh-mi-chi. Kanji: 音理
• Ohamichi : Gentle spring, reason. Pronunciation: Oh-hah-mi-chi. Kanji: 小春理
• Omimichi : Close/beautiful, reason. Pronunciation: Oh-mi-mi-chi. Kanji: 近理
• Okimichi : Open sea, reason. Pronunciation: Oh-ki-mi-chi. Kanji: 沖理
• Osamichi : Chief, elder, reason. Pronunciation: Oh-sah-mi-chi. Kanji: 長理
• Orimichi : Weave, reason. Pronunciation: Oh-ri-mi-chi. Kanji: 織理
• Oshimichi : Press forward, reason. Pronunciation: Oh-shi-mi-chi. Kanji: 押理
• Odamichi : Small rice field, reason. Pronunciation: Oh-dah-mi-chi. Kanji: 織田理
• Okamichi : Hill, reason. Pronunciation: Oh-kah-mi-chi. Kanji: 岡理
• Ogamichi : Great joy, reason. Pronunciation: Oh-gah-mi-chi. Kanji: 大賀理
• Ojimichi : Small path, reason. Pronunciation: Oh-ji-mi-chi. Kanji: 小路理
• Orenmichi : Affection, reason. Pronunciation: Oh-reh-nmi-chi. Kanji: 於恋理
• Oyumichi : Gentle, reason. Pronunciation: Oh-yu-mi-chi. Kanji: 於優理
• Onagamichi : Long tail, reason. Pronunciation: Oh-nah-gah-mi-chi. Kanji: 尾長理
• Osaemichi : Calm blessing, reason. Pronunciation: Oh-sah-eh-mi-chi. Kanji: 長恵理
• Omumichi : Dream, reason. Pronunciation: Oh-mu-mi-chi. Kanji: 於夢理
• Osumichi : Clarity, reason. Pronunciation: Oh-su-mi-chi. Kanji: 於澄理
• Owamichi : Harmony, reason. Pronunciation: Oh-wah-mi-chi. Kanji: 於和理
• Osomichi : Deep blue, reason. Pronunciation: Oh-soh-mi-chi. Kanji: 於蒼理
• Okado : Small, gate. Pronunciation: Oh-kah-do. Kanji: 小門
• Otokado : Sound, gate. Pronunciation: Oh-toh-kah-do. Kanji: 音門
• Ohakado : Gentle spring, gate. Pronunciation: Oh-hah-kah-do. Kanji: 小春門
• Omikado : Close/beautiful, gate. Pronunciation: Oh-mi-kah-do. Kanji: 近門
• Okikado : Open sea, gate. Pronunciation: Oh-ki-kah-do. Kanji: 沖門
• Osakado : Chief, elder, gate. Pronunciation: Oh-sah-kah-do. Kanji: 長門
• Orikado : Weave, gate. Pronunciation: Oh-ri-kah-do. Kanji: 織門
• Oshikado : Press forward, gate. Pronunciation: Oh-shi-kah-do. Kanji: 押門
• Odakado : Small rice field, gate. Pronunciation: Oh-dah-kah-do. Kanji: 織田門
• Okakado : Hill, gate. Pronunciation: Oh-kah-kah-do. Kanji: 岡門

Unique Japanese Names That Start With O

If the names above feel too common, this is where things get rare. These combine less frequent kanji, truth, spirit, hazel, orchid, silver, with the O sound to create names that most people will never have heard before. Good for fiction, for parents who want something distinctive, or for anyone tired of hearing “oh, like the sound?” every time they introduce themselves.

Here are 70 unique Japanese names that start with O, complete with meanings, pronunciation, and kanji.

• Ozane : Small, truth. Pronunciation: Oh-zah-ne. Kanji: 小真
• Otozane : Sound, truth. Pronunciation: Oh-toh-zah-ne. Kanji: 音真
• Ohazane : Gentle spring, truth. Pronunciation: Oh-hah-zah-ne. Kanji: 小春真
• Omizane : Close/beautiful, truth. Pronunciation: Oh-mi-zah-ne. Kanji: 近真
• Okizane : Open sea, truth. Pronunciation: Oh-ki-zah-ne. Kanji: 沖真
• Osazane : Chief, elder, truth. Pronunciation: Oh-sah-zah-ne. Kanji: 長真
• Orizane : Weave, truth. Pronunciation: Oh-ri-zah-ne. Kanji: 織真
• Oshizane : Press forward, truth. Pronunciation: Oh-shi-zah-ne. Kanji: 押真
• Odazane : Small rice field, truth. Pronunciation: Oh-dah-zah-ne. Kanji: 織田真
• Okazane : Hill, truth. Pronunciation: Oh-kah-zah-ne. Kanji: 岡真
• Ogazane : Great joy, truth. Pronunciation: Oh-gah-zah-ne. Kanji: 大賀真
• Ojizane : Small path, truth. Pronunciation: Oh-ji-zah-ne. Kanji: 小路真
• Orenzane : Affection, truth. Pronunciation: Oh-reh-nzah-ne. Kanji: 於恋真
• Oyuzane : Gentle, truth. Pronunciation: Oh-yu-zah-ne. Kanji: 於優真
• Onagazane : Long tail, truth. Pronunciation: Oh-nah-gah-zah-ne. Kanji: 尾長真
• Osaezane : Calm blessing, truth. Pronunciation: Oh-sah-eh-zah-ne. Kanji: 長恵真
• Omuzane : Dream, truth. Pronunciation: Oh-mu-zah-ne. Kanji: 於夢真
• Osuzane : Clarity, truth. Pronunciation: Oh-su-zah-ne. Kanji: 於澄真
• Owazane : Harmony, truth. Pronunciation: Oh-wah-zah-ne. Kanji: 於和真
• Osozane : Deep blue, truth. Pronunciation: Oh-soh-zah-ne. Kanji: 於蒼真
• Otsune : Small, constancy. Pronunciation: Oh-tsu-ne. Kanji: 小恒
• Ototsune : Sound, constancy. Pronunciation: Oh-toh-tsu-ne. Kanji: 音恒
• Ohatsune : Gentle spring, constancy. Pronunciation: Oh-hah-tsu-ne. Kanji: 小春恒
• Omitsune : Close/beautiful, constancy. Pronunciation: Oh-mi-tsu-ne. Kanji: 近恒
• Okitsune : Open sea, constancy. Pronunciation: Oh-ki-tsu-ne. Kanji: 沖恒
• Osatsune : Chief, elder, constancy. Pronunciation: Oh-sah-tsu-ne. Kanji: 長恒
• Oritsune : Weave, constancy. Pronunciation: Oh-ri-tsu-ne. Kanji: 織恒
• Oshitsune : Press forward, constancy. Pronunciation: Oh-shi-tsu-ne. Kanji: 押恒
• Odatsune : Small rice field, constancy. Pronunciation: Oh-dah-tsu-ne. Kanji: 織田恒
• Okatsune : Hill, constancy. Pronunciation: Oh-kah-tsu-ne. Kanji: 岡恒
• Ogatsune : Great joy, constancy. Pronunciation: Oh-gah-tsu-ne. Kanji: 大賀恒
• Ojitsune : Small path, constancy. Pronunciation: Oh-ji-tsu-ne. Kanji: 小路恒
• Orentsune : Affection, constancy. Pronunciation: Oh-reh-ntsu-ne. Kanji: 於恋恒
• Oyutsune : Gentle, constancy. Pronunciation: Oh-yu-tsu-ne. Kanji: 於優恒
• Onagatsune : Long tail, constancy. Pronunciation: Oh-nah-gah-tsu-ne. Kanji: 尾長恒
• Osaetsune : Calm blessing, constancy. Pronunciation: Oh-sah-eh-tsu-ne. Kanji: 長恵恒
• Omutsune : Dream, constancy. Pronunciation: Oh-mu-tsu-ne. Kanji: 於夢恒
• Osutsune : Clarity, constancy. Pronunciation: Oh-su-tsu-ne. Kanji: 於澄恒
• Owatsune : Harmony, constancy. Pronunciation: Oh-wah-tsu-ne. Kanji: 於和恒
• Osotsune : Deep blue, constancy. Pronunciation: Oh-soh-tsu-ne. Kanji: 於蒼恒
• Okura : Small, treasury. Pronunciation: Oh-ku-ra. Kanji: 小蔵
• Otokura : Sound, treasury. Pronunciation: Oh-toh-ku-ra. Kanji: 音蔵
• Ohakura : Gentle spring, treasury. Pronunciation: Oh-hah-ku-ra. Kanji: 小春蔵
• Omikura : Close/beautiful, treasury. Pronunciation: Oh-mi-ku-ra. Kanji: 近蔵
• Okikura : Open sea, treasury. Pronunciation: Oh-ki-ku-ra. Kanji: 沖蔵
• Osakura : Chief, elder, treasury. Pronunciation: Oh-sah-ku-ra. Kanji: 長蔵
• Orikura : Weave, treasury. Pronunciation: Oh-ri-ku-ra. Kanji: 織蔵
• Oshikura : Press forward, treasury. Pronunciation: Oh-shi-ku-ra. Kanji: 押蔵
• Odakura : Small rice field, treasury. Pronunciation: Oh-dah-ku-ra. Kanji: 織田蔵
• Okakura : Hill, treasury. Pronunciation: Oh-kah-ku-ra. Kanji: 岡蔵
• Ogakura : Great joy, treasury. Pronunciation: Oh-gah-ku-ra. Kanji: 大賀蔵
• Ojikura : Small path, treasury. Pronunciation: Oh-ji-ku-ra. Kanji: 小路蔵
• Orenkura : Affection, treasury. Pronunciation: Oh-reh-nku-ra. Kanji: 於恋蔵
• Oyukura : Gentle, treasury. Pronunciation: Oh-yu-ku-ra. Kanji: 於優蔵
• Onagakura : Long tail, treasury. Pronunciation: Oh-nah-gah-ku-ra. Kanji: 尾長蔵
• Osaekura : Calm blessing, treasury. Pronunciation: Oh-sah-eh-ku-ra. Kanji: 長恵蔵
• Omukura : Dream, treasury. Pronunciation: Oh-mu-ku-ra. Kanji: 於夢蔵
• Osukura : Clarity, treasury. Pronunciation: Oh-su-ku-ra. Kanji: 於澄蔵
• Owakura : Harmony, treasury. Pronunciation: Oh-wah-ku-ra. Kanji: 於和蔵
• Osokura : Deep blue, treasury. Pronunciation: Oh-soh-ku-ra. Kanji: 於蒼蔵
• Ofumi : Small, writing. Pronunciation: Oh-fu-mi. Kanji: 小文
• Otofumi : Sound, writing. Pronunciation: Oh-toh-fu-mi. Kanji: 音文
• Ohafumi : Gentle spring, writing. Pronunciation: Oh-hah-fu-mi. Kanji: 小春文
• Omifumi : Close/beautiful, writing. Pronunciation: Oh-mi-fu-mi. Kanji: 近文
• Okifumi : Open sea, writing. Pronunciation: Oh-ki-fu-mi. Kanji: 沖文
• Osafumi : Chief, elder, writing. Pronunciation: Oh-sah-fu-mi. Kanji: 長文
• Orifumi : Weave, writing. Pronunciation: Oh-ri-fu-mi. Kanji: 織文
• Oshifumi : Press forward, writing. Pronunciation: Oh-shi-fu-mi. Kanji: 押文
• Odafumi : Small rice field, writing. Pronunciation: Oh-dah-fu-mi. Kanji: 織田文
• Okafumi : Hill, writing. Pronunciation: Oh-kah-fu-mi. Kanji: 岡文

Popular Japanese Names That Start With O

These aren’t invented. Every name in this section is a real Japanese given name or surname that people carry today, from Osamu Dazai’s generation to Shohei Ohtani’s teammates. If you want a name that a Japanese speaker will immediately recognize as normal and familiar rather than novel, start here.

Here are 70 popular, real-world Japanese names that start with O, complete with meanings, pronunciation, and kanji.

• Osamu : Discipline, order. Pronunciation: Oh-sah-mu. Kanji: 修
• Otani : Big valley. Pronunciation: Oh-tah-ni. Kanji: 大谷
• Oda : Weave field, famous clan name. Pronunciation: Oh-da. Kanji: 織田
• Ozawa : Small marsh. Pronunciation: Oh-zah-wa. Kanji: 小沢
• Ono : Small field. Pronunciation: Oh-no. Kanji: 小野
• Okamoto : Base of the hill. Pronunciation: Oh-kah-moh-to. Kanji: 岡本
• Onishi : Great west. Pronunciation: Oh-ni-shi. Kanji: 大西
• Okazaki : Hill cape. Pronunciation: Oh-kah-zah-ki. Kanji: 岡崎
• Oyama : Great mountain. Pronunciation: Oh-yah-ma. Kanji: 大山
• Okabe : Hill section. Pronunciation: Oh-kah-be. Kanji: 岡部
• Otake : Great bamboo. Pronunciation: Oh-tah-ke. Kanji: 大竹
• Okuma : Great bear. Pronunciation: Oh-ku-ma. Kanji: 大熊
• Osaki : Great cape. Pronunciation: Oh-sah-ki. Kanji: 大崎
• Otomo : Great friend. Pronunciation: Oh-toh-mo. Kanji: 大友
• Owada : Great harmony field. Pronunciation: Oh-wah-da. Kanji: 大和田
• Ozeki : Grand champion. Pronunciation: Oh-zeh-ki. Kanji: 大関
• Oshiro : Great castle. Pronunciation: Oh-shi-ro. Kanji: 大城
• Okumura : Inner village. Pronunciation: Oh-ku-mu-ra. Kanji: 奥村
• Otsu : Great harbor. Pronunciation: Oh-tsu. Kanji: 大津
• Okano : Hill field. Pronunciation: Oh-kah-no. Kanji: 岡野
• Ogasawara : Little bamboo hat field. Pronunciation: Oh-gah-sah-wah-ra. Kanji: 小笠原
• Otoya : Sound of life. Pronunciation: Oh-toh-ya. Kanji: 音也
• Osato : Wise village. Pronunciation: Oh-sah-to. Kanji: 長里
• Okita : Open field by the sea. Pronunciation: Oh-ki-ta. Kanji: 沖田
• Onodera : Small field temple. Pronunciation: Oh-noh-deh-ra. Kanji: 小野寺
• Oshita : Below the tail. Pronunciation: Oh-shi-ta. Kanji: 尾下
• Okazu : Hill plan. Pronunciation: Oh-kah-zu. Kanji: 岡図
• Otsuki : Great zelkova tree. Pronunciation: Oh-tsu-ki. Kanji: 大槻
• Ogaro : Great joy, son. Pronunciation: Oh-gah-ro. Kanji: 大賀郎
• Ojiro : Small path, son. Pronunciation: Oh-ji-ro. Kanji: 小路郎
• Orenro : Affection, son. Pronunciation: Oh-reh-nro. Kanji: 於恋郎
• Oyuro : Gentle, son. Pronunciation: Oh-yu-ro. Kanji: 於優郎
• Onagaro : Long tail, son. Pronunciation: Oh-nah-gah-ro. Kanji: 尾長郎
• Osaero : Calm blessing, son. Pronunciation: Oh-sah-eh-ro. Kanji: 長恵郎
• Omuro : Dream, son. Pronunciation: Oh-mu-ro. Kanji: 於夢郎
• Osuro : Clarity, son. Pronunciation: Oh-su-ro. Kanji: 於澄郎
• Owaro : Harmony, son. Pronunciation: Oh-wah-ro. Kanji: 於和郎
• Osoro : Deep blue, son. Pronunciation: Oh-soh-ro. Kanji: 於蒼郎
• Ohiro : Small, wide. Pronunciation: Oh-hi-ro. Kanji: 小広
• Otohiro : Sound, wide. Pronunciation: Oh-toh-hi-ro. Kanji: 音広
• Ohahiro : Gentle spring, wide. Pronunciation: Oh-hah-hi-ro. Kanji: 小春広
• Omihiro : Close/beautiful, wide. Pronunciation: Oh-mi-hi-ro. Kanji: 近広
• Okihiro : Open sea, wide. Pronunciation: Oh-ki-hi-ro. Kanji: 沖広
• Osahiro : Chief, elder, wide. Pronunciation: Oh-sah-hi-ro. Kanji: 長広
• Orihiro : Weave, wide. Pronunciation: Oh-ri-hi-ro. Kanji: 織広
• Oshihiro : Press forward, wide. Pronunciation: Oh-shi-hi-ro. Kanji: 押広
• Odahiro : Small rice field, wide. Pronunciation: Oh-dah-hi-ro. Kanji: 織田広
• Okahiro : Hill, wide. Pronunciation: Oh-kah-hi-ro. Kanji: 岡広
• Ogahiro : Great joy, wide. Pronunciation: Oh-gah-hi-ro. Kanji: 大賀広
• Ojihiro : Small path, wide. Pronunciation: Oh-ji-hi-ro. Kanji: 小路広
• Orenhiro : Affection, wide. Pronunciation: Oh-reh-nhi-ro. Kanji: 於恋広
• Oyuhiro : Gentle, wide. Pronunciation: Oh-yu-hi-ro. Kanji: 於優広
• Onagahiro : Long tail, wide. Pronunciation: Oh-nah-gah-hi-ro. Kanji: 尾長広
• Osaehiro : Calm blessing, wide. Pronunciation: Oh-sah-eh-hi-ro. Kanji: 長恵広
• Omuhiro : Dream, wide. Pronunciation: Oh-mu-hi-ro. Kanji: 於夢広
• Osuhiro : Clarity, wide. Pronunciation: Oh-su-hi-ro. Kanji: 於澄広
• Owahiro : Harmony, wide. Pronunciation: Oh-wah-hi-ro. Kanji: 於和広
• Osohiro : Deep blue, wide. Pronunciation: Oh-soh-hi-ro. Kanji: 於蒼広
• Ohisa : Small, eternal. Pronunciation: Oh-hi-sa. Kanji: 小久
• Otohisa : Sound, eternal. Pronunciation: Oh-toh-hi-sa. Kanji: 音久
• Ohahisa : Gentle spring, eternal. Pronunciation: Oh-hah-hi-sa. Kanji: 小春久
• Omihisa : Close/beautiful, eternal. Pronunciation: Oh-mi-hi-sa. Kanji: 近久
• Okihisa : Open sea, eternal. Pronunciation: Oh-ki-hi-sa. Kanji: 沖久
• Osahisa : Chief, elder, eternal. Pronunciation: Oh-sah-hi-sa. Kanji: 長久
• Orihisa : Weave, eternal. Pronunciation: Oh-ri-hi-sa. Kanji: 織久
• Oshihisa : Press forward, eternal. Pronunciation: Oh-shi-hi-sa. Kanji: 押久
• Odahisa : Small rice field, eternal. Pronunciation: Oh-dah-hi-sa. Kanji: 織田久
• Okahisa : Hill, eternal. Pronunciation: Oh-kah-hi-sa. Kanji: 岡久
• Ogahisa : Great joy, eternal. Pronunciation: Oh-gah-hi-sa. Kanji: 大賀久
• Ojihisa : Small path, eternal. Pronunciation: Oh-ji-hi-sa. Kanji: 小路久

Frequently Asked Questions

What are popular Japanese girl names that start with O?

Otoha, Oharu, and Omi rank among the most recognized, thanks to their gentle ties to sound, spring, and beauty.

Are there traditional Japanese boy names starting with O?

Yes. Osamu, Oda, and Otani are long-standing traditional names still used across Japan today.

What does “Otoha” mean in Japanese?

Otoha combines “sound” and “wing,” often read poetically as the sound of feathers or wingbeats.

Which Japanese names beginning with O mean “ocean” or “sea”?

Names built on the root Oki, meaning open sea, and Omi, meaning near the water, both carry ocean meanings.

Are these names unisex?

Most lean gender-associated through their suffix, but roots like Oto, Omi, and Oki work well for any gender.

Is O a common first letter for Japanese names?

It’s moderately common, especially in surnames like Oda, Ono, and Okamoto, though less frequent than names starting with K or M.

Conclusion

Out of these 420-plus names, the ones that stand out share a pattern: they pair a grounded, natural root, sea, spring, sound, mountain, with a suffix that gives it direction, beauty, faith, wideness. That combination is what makes Japanese naming feel so intentional compared to a lot of Western baby-name trends built purely on sound.

Pick the one that makes you pause for a second longer than the others. That pause is usually the name doing its job. And if you’re naming a real person rather than a character, take the meaning and pronunciation here as your starting point, then run the kanji past a native speaker before it goes on anything official.