| Osgood | - | United States Name | Oshea | - | Biblical Name |
| Oshele | - | Yiddish Name | Osher | - | Yiddish Name |
| Osherl | - | Yiddish Name | Oshie | - | Yiddish Name |
| Oshrele | - | Yiddish Name | Oshry | - | Yiddish Name |
| Oshy | - | Yiddish Name | OSIP | - | Russian Name |
| Osiris | - | Egyptian Name | Osita | - | Cameroon Name |
| Oskar | - | Swiss Name | Oskari | - | Finnish Name |
| Osman | - | Algerian Name | Osman, Usman | - | Indian Name |
| Osmund | - | Norse Name | Osrick | - | West Indies Name |
| Ostap | - | Ukrainian Name | Ostapenko | - | Ukrainian Name |
| Osten | - | Latin Name | Ostrel | - | Cyprien Name |
| Osvaldo | - | Portuguese Name | Oswald | - | Swiss Name |
| Oswin | - | West Indies Name | Osye | - | Yiddish Name |
| Otadan | - | American Name | Otaktay | - | American Name |
| Otávio | - | Portuguese Name | Othal | - | Phoenician Name |
| Othean | - | Cyprien Name | Othieno | - | African Name |
| Othmael | - | Phoenician Name | Othmar | - | Phoenician Name |
| Othmir | - | Phoenician Name | Othni | - | Biblical Name |
| Othniel | - | Biblical Name | Othnion | - | Phoenician Name |
| Othriel | - | Phoenician Name | Othzar | - | Phoenician Name |
| Otik | - | Czechoslovakian Name | Otis | - | German Name |
| Otoahhastis | - | American Name |
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