| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| OGECHUKWUKAMA | - | Western African, Igbo | ||
| OGHENEKARO | - | Western African, Urhobo | ||
| OGHENEKEVWE | - | Western African, Urhobo | ||
| OGHENERO | - | Western African, Urhobo | ||
| OGNEN | - | Macedonian | ||
| OGNENA | - | Macedonian | ||
| OGNIAN | - | Bulgarian | ||
| OGNJAN | - | Croatian, Serbian | ||
| OGNJEN | - | Croatian, Serbian | ||
| OGNYAN | - | Bulgarian | ||
| OGNYANA | - | Bulgarian | ||
| OHAD | - | Biblical | ||
| OHANNES | - | Armenian | ||
| OIDIPOUS | - | Greek Mythology | ||
| OIER | - | Basque |