| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| OLWYN | - | Welsh | ||
| OLYA | - | Russian | ||
| OLYMPE | - | French | ||
| Olympia | [əu'limpiə] | |||
| OLYMPIA | - | Greek, Slovak | ||
| OLYMPIAS | - | Ancient Greek | ||
| OLYVIA | ə-LIV-ee-ə | English (Rare) | ||
| OMOLARA | - | Western African, Yoruba | ||
| ONÓRA | - | Irish | ||
| ONA (1) | - | Lithuanian | ||
| ONA (2) | - | Catalan | ||
| ONDINA | - | Portuguese, Italian | ||
| ONEIDA | o-NIE-də | English | ||
| ONI | - | Western African, Yoruba | ||
| ONYEKA | - | Western African, Igbo |