| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| OLAMILEKAN | - | Western African, Yoruba | ||
| OLANREWAJU | - | Western African, Yoruba | ||
| OLAV | - | Norwegian, Danish | ||
| OLAVI | O-lah-vee (Finnish) | Finnish, Estonian | ||
| OLAVO | - | Portuguese | ||
| OLDŘICH | - | Czech | ||
| OLDRICH | - | Slovak | ||
| OLE | OL-e (Danish) | Danish, Norwegian | ||
| OLEG | ah-LYEK | Russian | ||
| OLEGÁRIO | - | Portuguese | ||
| OLEGARIO | - | Spanish | ||
| OLEK | AW-lek | Polish | ||
| OLEKSANDER | - | Ukrainian | ||
| OLEKSANDR | - | Ukrainian | ||
| OLEKSIY | - | Ukrainian |