| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Okropir | - | Georgian | ||
| Oksana | ahk-SAH-nah (Russian) | Ukrainian, Russian | ||
| OlÍVia | - | Portuguese, Slovak, Hungarian | ||
| Ola (1) | - | Norwegian, Swedish | ||
| Olabode | - | Western African, Yoruba | ||
| Olaf | O-lahf (German, Dutch) | Norwegian, Danish, German, Dutch, Polish | ||
| Olalla | o-LAH-yah | Spanish | ||
| Olamide | - | Western African, Yoruba | ||
| Olamilekan | - | Western African, Yoruba | ||
| Olanrewaju | - | Western African, Yoruba | ||
| Olav | - | Norwegian, Danish | ||
| Olavi | O-lah-vee (Finnish) | Finnish, Estonian | ||
| Olayinka | - | Western African, Yoruba | ||
| Oldrich | - | Slovak | ||
| Ole | OL-e (Danish) | Danish, Norwegian |