| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| 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 | ||
| Oier | - | Basque | ||
| Oihana | - | Basque | ||
| Okoro | - | Western African, Urhobo |