| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ola (2) | AW-lah | Polish | ||
| Olaf | O-lahf (German, Dutch) | Norwegian, Danish, German, Dutch, Polish | ||
| Olek | AW-lek | Polish | ||
| Olga | OL-gah (Russian), AWL-gah (Polish, German) | Russian, Ukrainian, Polish, German, Swedish, Norwegian, Danish, Icelandic, Latvian, Hungarian, Itali | ||
| Olimpia | aw-LEEM-pyah (Polish) | Italian, Spanish, Romanian, Polish, Hungarian | ||
| Oliwia | aw-LEEV-yah | Polish | ||
| Oliwier | aw-LEEV-yer | Polish | ||
| Oskar | AWS-kahr (German, Polish) | Swedish, Norwegian, Danish, German, Polish | ||
| Otylia | - | Polish |