| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Oleg | ah-LYEK | Russian | ||
| Olegario | - | Spanish | ||
| Oleksander | - | Ukrainian | ||
| Oleksandr | - | Ukrainian | ||
| Oleksandra | - | Ukrainian | ||
| Oleksiy | - | Ukrainian | ||
| Olena | - | Ukrainian | ||
| Oles | - | Ukrainian | ||
| Olev | - | Estonian | ||
| Olexiy | - | Ukrainian | ||
| Olga | OL-gah (Russian), AWL-gah (Polish, German) | Russian, Ukrainian, Polish, German, Swedish, Norwegian, Danish, Icelandic, Latvian, Hungarian, Itali | ||
| Olgica | - | Macedonian, Serbian | ||
| Olha | - | Ukrainian | ||
| Olimpia | aw-LEEM-pyah (Polish) | Italian, Spanish, Romanian, Polish, Hungarian | ||
| OlivÉR | O-lee-vayr | Hungarian |