| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ortrun | AWRT-roon | German | ||
| Ortwin | AWRT-veen (German) | German, Ancient Germanic | ||
| Ortzi | - | Basque | ||
| Osama | - | Arabic | ||
| Osamu | o-sah-moo | Japanese | ||
| Osane | - | Basque | ||
| Osanna | - | Italian (Rare) | ||
| Osanne | - | French (Rare) | ||
| Osbeorn | - | Anglo-Saxon | ||
| Osberht | - | Anglo-Saxon | ||
| Osbert | AHZ-bərt | English (Rare) | ||
| Osbourne | AHZ-born | English (Rare) | ||
| Oscar | AHS-kər (English) | English, Irish, Portuguese (Brazilian), Italian, Swedish, Norwegian, Danish, Dutch, French, Irish My | ||
| Osee | - | Biblical Latin, Biblical Greek | ||
| Osgar | - | Anglo-Saxon |