| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Okoro | - | Western African, Urhobo | ||
| OlÍVia | - | Portuguese, Slovak, Hungarian | ||
| Olabode | - | Western African, Yoruba | ||
| Olamide | - | Western African, Yoruba | ||
| Olamilekan | - | Western African, Yoruba | ||
| Olanrewaju | - | Western African, Yoruba | ||
| Olavi | O-lah-vee (Finnish) | Finnish, Estonian | ||
| Olavo | - | Portuguese | ||
| Olayinka | - | Western African, Yoruba | ||
| OlegÁRio | - | Portuguese | ||
| Olev | - | Estonian | ||
| Oliver | AHL-ə-vər (English), AW-lee-ver (German), O-lee-ver (Finnish) | English, German, Swedish, Norwegian, Danish, Finnish, Estonian, Serbian, Croatian, Macedonian, Czech | ||
| Olubunmi | - | Western African, Yoruba | ||
| Oluchi | - | Western African, Igbo | ||
| Olufemi | - | Western African, Yoruba |