| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ofydd | - | Welsh | ||
| Ogden | AWG-dən | English | ||
| Ogechi | - | Western African, Igbo | ||
| Ogechukwukama | - | Western African, Igbo | ||
| Oghenekaro | - | Western African, Urhobo | ||
| Oghenekevwe | - | Western African, Urhobo | ||
| Oghenero | - | Western African, Urhobo | ||
| Ognjan | - | Croatian, Serbian | ||
| Ognjen | - | Croatian, Serbian | ||
| Oier | - | Basque | ||
| Oighrig | - | Scottish | ||
| Oihana | - | Basque | ||
| Oili | OY-lee | Finnish | ||
| OisÍN | OSH-een, USH-een | Irish, Irish Mythology | ||
| Oiva | OY-vah | Finnish |