| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| ORPAH | AWR-pə (English) | Biblical | ||
| ORPHA | AWR-fə (English) | Biblical, English | ||
| ORSINA | - | Italian | ||
| ORSOLA | OR-so-lah | Italian | ||
| ORSOLYA | - | Hungarian | ||
| ORTRUN | AWRT-roon | German | ||
| ORVOKKI | OR-vok-kee | Finnish | ||
| OSANE | - | Basque | ||
| OSANNA | - | Italian (Rare) | ||
| OSANNE | - | French (Rare) | ||
| OTÁVIA | - | Portuguese (Brazilian) | ||
| OTTAVIA | - | Italian | ||
| OTTILIA | oot-TEE-lee-ah | Swedish | ||
| OTTILIE | o-TEE-lee-ə | German | ||
| OTTOLINE | - | English (Rare) |