| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Osborn | AHZ-born | English | ||
| Osborne | AHZ-born | English | ||
| Osbourne | AHZ-born | English (Rare) | ||
| Oscar | AHS-kər (English) | English, Irish, Portuguese (Brazilian), Italian, Swedish, Norwegian, Danish, Dutch, French, Irish My | ||
| Osgar | - | Anglo-Saxon | ||
| Osheen | - | Irish | ||
| Osip | O-seep | Russian | ||
| Oskar | AWS-kahr (German, Polish) | Swedish, Norwegian, Danish, German, Polish | ||
| Oskari | OS-kah-ree | Finnish | ||
| Osku | OS-koo | Finnish | ||
| Osman | - | Turkish | ||
| Osmond | AHZ-mənd | English (Rare) | ||
| Osmund | - | Anglo-Saxon | ||
| Osvald | - | Swedish, Norwegian, Danish | ||
| Osvaldo | - | Spanish, Italian, Portuguese |