| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Onesimus | o-NES-i-məs (English) | Biblical, Biblical Latin | ||
| Onesiphoros | - | Ancient Greek, Biblical Greek | ||
| Onesiphorus | - | Biblical, Biblical Latin | ||
| Ophir | - | Biblical | ||
| Ophrah | AWF-rə (English) | Biblical | ||
| Orpah | AWR-pə (English) | Biblical | ||
| 'Orpah | - | Biblical Hebrew | ||
| Orpha | AWR-fə (English) | Biblical, English | ||
| Osee | - | Biblical Latin, Biblical Greek | ||
| Oshea | - | Biblical | ||
| Othniel | AWTH-nee-əl (English) | Biblical | ||
| Ourbanos | - | Biblical Greek | ||
| Ouri | - | Biblical Greek | ||
| Ourias | - | Biblical Greek | ||
| 'Ovadyah | - | Biblical Hebrew |