| 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 | ||
| Ognjan | - | Croatian, Serbian | ||
| Ognjen | - | Croatian, Serbian | ||
| Ohad | - | Biblical | ||
| Oighrig | - | Scottish | ||
| Okoro | - | Western African, Urhobo | ||
| Olabode | - | Western African, Yoruba | ||
| Olaf | O-lahf (German, Dutch) | Norwegian, Danish, German, Dutch, Polish | ||
| Olamide | - | Western African, Yoruba | ||
| Olamilekan | - | Western African, Yoruba |