| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| ODRAN | - | Irish | ||
| ODTSETSEG | - | Mongolian | ||
| ODYSSEUS | o-DIS-ee-əs (English) | Greek Mythology | ||
| OEDIPUS | ED-i-pəs (English), EED-i-pəs (English) | Greek Mythology (Latinized) | ||
| OENONE | - | Greek Mythology (Latinized) | ||
| OFÉLIA | - | Portuguese | ||
| OFEK | - | Hebrew | ||
| OFELIA | o-FE-lyah | Spanish, Italian | ||
| OFER | - | Hebrew | ||
| OFIR | - | Hebrew, Biblical Hebrew | ||
| OFRA | - | Hebrew | ||
| OFYDD | - | Welsh | ||
| Ogden | ['ɔ:gdən] | |||
| OGDEN | AWG-dən | English | ||
| OGECHI | - | Western African, Igbo |