| Oshae | Unisex | American Names |
| Osher | Man | Hebrew Names |
| Osias | Man | Hebrew Names |
| Osinachi | Unisex | African - Nigeria Names |
| Osiris | Man | Greek Names |
| Oslo | Unisex | Scandinavian Names |
| Osma | Woman | American Names |
| Osman | Man | Arabic Names |
| Osmond | Man | English Names |
| Osmund | Man | English Names |
| Osmundo | Man | Spanish Names |
| Osric | Man | English Names |
| Ossian | Man | Irish Names |
| Ossie | Man | English Names |
| Ostara | Woman | English Names |
| Ostosia | Woman | German - Proto-Germanic Names |
| Osvaldo | Man | Spanish Names |
| Oswald | Man | English Names |
| Oswaldo | Man | Spanish Names |
| Oswine | Man | English Names |