| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Olivia | ə-LIV-ee-ə (English), o-LEE-vyah (Italian, Spanish), o-LEE-vee-ah (German), O-lee-vee-ah (Finnish) | English, Italian, Spanish, German, Finnish, Swedish, Norwegian, Danish | ||
| Olivie | o-lee-VEE (French) | French, Czech | ||
| Olivier | o-lee-VYE (French), O-lee-veer (Dutch) | French, Dutch | ||
| Ollie | AHL-ee | English | ||
| Olympe | - | French | ||
| Olympias | - | Ancient Greek | ||
| Olympiodoros | - | Ancient Greek | ||
| Olympos | - | Ancient Greek | ||
| Olyvia | ə-LIV-ee-ə | English (Rare) | ||
| Omar (1) | - | Arabic, English | ||
| OnÉSime | - | French | ||
| Oneida | o-NIE-də | English | ||
| Onesimos | - | Ancient Greek, Biblical Greek | ||
| Onesiphoros | - | Ancient Greek, Biblical Greek | ||
| Onfroi | - | Medieval French |