| Name | Meaning | Gender | Origin | Rashi |
|---|---|---|---|---|
| Osvaldo | Power of God | 👦 Boy | Spanish | — |
| Oswaldo | Power of God | 👦 Boy | Spanish | — |
| Otabek | Father-lord | 👦 Boy | Uzbek | — |
| Otavio | Eighth (Octavio) | 👦 Boy | Portuguese | — |
| Otello | Wealth; Prosperity | 👦 Boy | Italian | — |
| Othman | Baby bustard; After Caliph Uthman | 👦 Boy | Arabic | — |
| Othmane | After Caliph Uthman | 👦 Boy | Arabic | — |
| Othmen | After Caliph Uthman | 👦 Boy | Arabic | — |
| Otieno | Born at night | 👦 Boy | Luo | — |
| Otilia | Prosperous in battle | 👧 Girl | Spanish | — |
| Otis | Wealth; Son of Otto | 👦 Boy | English | — |
| Otman | After Caliph Uthman | 👦 Boy | Arabic | — |
| Otmane | After Caliph Uthman | 👦 Boy | Arabic | — |
| Otoniel | Lion of God | 👦 Boy | Spanish | — |
| Ottavia | Eighth | 👧 Girl | Italian | — |
| Ottavio | Eighth | 👦 Boy | Italian | — |
| Otto | Wealth; Prosperity | 👦 Boy | German | — |
| Ouafae | Loyalty; Faithfulness (Wafaa) | 👧 Girl | Arabic | — |
| Oualid | Newborn (Walid) | 👦 Boy | Arabic | — |
| Oumaima | Little mother | 👧 Girl | Arabic | — |
| Oumar | Long-lived (Umar) | 👦 Boy | West African | — |
| Oumarou | Long-lived (Umar) | 👦 Boy | Hausa | — |
| Oumayma | Little mother | 👧 Girl | Arabic | — |
| Oumnia | Wish; Desire | 👧 Girl | Arabic | — |
| Oumou | Mother (after the Prophet's family) | 👧 Girl | West African | — |
| Ourania | Heavenly | 👧 Girl | Greek | — |
| Ousmane | Uthman | 👦 Boy | West African | — |
| Ousmanou | After Caliph Uthman | 👦 Boy | Fulani | — |
| Oussama | Lion | 👦 Boy | Arabic | — |
| Oussema | Lion | 👦 Boy | Arabic | — |
| Outi | Wealth; Prosperous | 👧 Girl | Finnish | — |
| Ovidio | Shepherd | 👦 Boy | Spanish | — |
| Ovidiu | Shepherd | 👦 Boy | Romanian | — |
| Oviya | Artist; Painting | 👧 Girl | Tamil | Vrishabh |
| Owain | Well-born; Noble | 👦 Boy | Welsh | — |
| Owais | Little wolf; A devoted Yemeni saint | 👦 Boy | Arabic | — |
| Owen | Well-born; Noble | 👦 Boy | Welsh | — |
| Owolabi | Money has given birth to wealth | 👦 Boy | Yoruba | — |
| Owusu | Akan clan name | 👦 Boy | Akan | — |
| Oxana | Hospitality; Praise to God | 👧 Girl | Russian | — |
| Oya | Patience; Yoruba goddess of wind | 👧 Girl | Turkish | — |
| Oydin | Moonlight; Bright | 👧 Girl | Uzbek | — |
| Oyewole | Honour enters the home | 👦 Boy | Yoruba | — |
| Oyindamola | Honey mixed with wealth | 👧 Girl | Yoruba | — |
| Öykü | Story | 👧 Girl | Turkish | — |
| Oyun | Mind; Wisdom | 👧 Girl | Mongolian | — |
| Oz | Strength | 👦 Boy | Hebrew | — |
| Ozan | Bard; Poet | 👦 Boy | Turkish | — |
| Özay | Pure moon | 👧 Girl | Turkish | — |
| Özcan | Pure soul | 👦 Boy | Turkish | — |
| Özden | Pure; Genuine | 👧 Girl | Turkish | — |
| Özer | Pure man; Essential | 👦 Boy | Turkish | — |
| Özge | Different; Unique | 👧 Girl | Turkish | — |
| Özgül | Pure rose | 👧 Girl | Turkish | — |
| Özgün | Original; Unique | 👧 Girl | Turkish | — |
| Özgür | Free | 👦 Boy | Turkish | — |
| Özhan | Pure ruler | 👦 Boy | Turkish | — |
| Ozioma | Good news; God's goodness | 👧 Girl | Igbo | — |
| Özkan | Pure blood | 👦 Boy | Turkish | — |
| Özlem | Longing; Yearning | 👧 Girl | Turkish | — |
| Öznur | Pure light | 👧 Girl | Turkish | — |
| Øyvind | Island wanderer; Lucky warrior | 👦 Boy | Norwegian | — |