| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Obadiah | o-bə-DIE-ə (English) | Biblical | ||
| Obed | O-bed (English) | Biblical, Biblical Latin, Biblical Greek | ||
| Oded | - | Biblical | ||
| Ofir | - | Hebrew, Biblical Hebrew | ||
| Ohad | - | Biblical | ||
| Omar (2) | - | Biblical | ||
| Omri | - | Biblical, Hebrew, Biblical Hebrew | ||
| Onesimos | - | Ancient Greek, Biblical Greek | ||
| 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 | ||
| Orpha | AWR-fə (English) | Biblical, English |