| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| ONÉSIME | - | French | ||
| ONÓRA | - | Irish | ||
| ONA (1) | - | Lithuanian | ||
| ONA (2) | - | Catalan | ||
| ONDŘEJ | - | Czech | ||
| ONDINA | - | Portuguese, Italian | ||
| ONDREJ | - | Slovak | ||
| ONEIDA | o-NIE-də | English | ||
| ONESIMOS | - | Ancient Greek, Biblical Greek | ||
| ONESIMUS | o-NES-i-məs (English) | Biblical, Biblical Latin | ||
| ONESIPHOROS | - | Ancient Greek, Biblical Greek | ||
| ONESIPHORUS | - | Biblical, Biblical Latin | ||
| ONFROI | - | Medieval French | ||
| ONI | - | Western African, Yoruba | ||
| ONISIM | - | Russian (Rare) |