| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Oralee | - | English (Rare) | ||
| Oralie | - | English (Rare) | ||
| Oran | O-ran | Irish | ||
| Orfeo | - | Italian, Spanish | ||
| Orhan | - | Turkish | ||
| Origen | - | History | ||
| Orinda | - | English (Rare) | ||
| Orla (1) | OR-la | Irish | ||
| Orla (2) | - | Danish | ||
| Orlagh | - | Irish | ||
| Ormazd | OR-mazd | Persian Mythology | ||
| Ormond | AWR-mənd | English (Rare) | ||
| Ormonde | - | English (Rare) | ||
| Orna (1) | - | Irish | ||
| Ornat | - | Irish |