| Name | Gender | Meaning | Favorites |
| Osias | Boy | Salvation | |
| Osip | Boy | God wiIl multiply | |
| Osiris | Boy | Judge of the dead | |
| Osman | Boy | Tender Youth | |
| Ossama | Boy | One of the names of the lion | |
| Osvaldo | Boy | God power | |
| Oswald | Boy | Of God-Like Power | |
| Osya | Boy | God will add | |
| Othello | Boy | Prosperous | |
| Otis | Boy | Hears Well | |
| Ottakoothan | Boy | Poet | |
| Ottmar | Boy | A form of Osman | |
| Otto | Boy | Wealthy | |
| Ovadiah | Boy | Servant of God | |
| Ovadya | Boy | Serves God | |
| Ovidio | Boy | Shepherd | |
| Oviyan | Boy | Artist | |
| Owen | Boy | Born to nobility | |
| Ozturk | Boy | Pure | |
