| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Oluwayemisi | - | Western African, Yoruba | ||
| Omobolanle | - | Western African, Yoruba | ||
| Omolara | - | Western African, Yoruba | ||
| Oni | - | Western African, Yoruba | ||
| Onyeka | - | Western African, Igbo | ||
| Onyekachi | - | Western African, Igbo | ||
| Onyekachukwu | - | Western African, Igbo | ||
| Opeyemi | - | Western African, Yoruba | ||
| Otieno | - | Eastern African, Luo | ||
| Oyibo | - | Western African, Urhobo |