| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Oda | O-dah (German) | German, Ancient Germanic | ||
| Odalric | - | Ancient Germanic | ||
| Odila | - | Ancient Germanic | ||
| Odilia | - | Ancient Germanic | ||
| Odilo | - | Ancient Germanic | ||
| Odo | - | Ancient Germanic | ||
| Odoacer | o-do-AY-sər (English) | Ancient Germanic | ||
| Odovacar | o-do-VAY-kər (English) | Ancient Germanic | ||
| Ortwin | AWRT-veen (German) | German, Ancient Germanic | ||
| Othmar | - | German, Czech, Ancient Germanic | ||
| Otmar | - | German, Ancient Germanic | ||
| Otto | AW-to (German), AH-to (English), OT-to (Finnish) | German, Swedish, Norwegian, Danish, Dutch, English, Finnish, Ancient Germanic |