| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Olyvia | ə-LIV-ee-ə | English (Rare) | ||
| Om | - | Indian, Hindi, Marathi | ||
| Omar (1) | - | Arabic, English | ||
| Omar (2) | - | Biblical | ||
| Omega | o-MAY-gə (English) | Various | ||
| Omid | - | Persian | ||
| Omobolanle | - | Western African, Yoruba | ||
| Omolara | - | Western African, Yoruba | ||
| Omri | - | Biblical, Hebrew, Biblical Hebrew | ||
| Ona (1) | - | Lithuanian | ||
| Ona (2) | - | Catalan | ||
| Ondina | - | Portuguese, Italian | ||
| Ondrej | - | Slovak | ||
| Onesimos | - | Ancient Greek, Biblical Greek | ||
| Onesimus | o-NES-i-məs (English) | Biblical, Biblical Latin |