| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ovid | AH-vid (English) | History | ||
| Ovidio | - | Italian, Spanish | ||
| Owain | O-wien (Welsh, Welsh Mythology) | Welsh, Welsh Mythology, Arthurian Romance | ||
| Owen (1) | O-ən (English) | Welsh, English | ||
| Owen (2) | - | Irish | ||
| Owena | - | Welsh | ||
| Oxana | - | Ukrainian, Russian | ||
| Oyibo | - | Western African, Urhobo | ||
| Oz (1) | AHZ | English | ||
| Ozan | - | Turkish | ||
| Ozzie | AHZ-ee | English | ||
| Ozzy | AHZ-ee | English |