| Orad | - | Australian Name | Oran | - | Irish Name |
| Oreb | - | Biblical Name | Orenthal | - | Hebrew Name |
| Ori | - | Hindu Name | Ori | - | Indian Name |
| Orion | - | Greek Name | Orion | - | Hindu Name |
| Orlando | - | German Name | Ornan | - | Biblical Name |
| Orton | - | English Name | Orwel | - | Welsh Name |
| Osahar | - | Egyptian Name | OSAMA | - | Muslim Name |
| Osama | - | Algerian Name | Osaze | - | Egyptian Name |
| Oscar | - | English Name | Oshea | - | Biblical Name |
| OSIP | - | Russian Name | Osiris | - | Egyptian Name |
| Oskari | - | Finnish Name | Osman | - | Algerian Name |
| Osman, Usman | - | Indian Name | Osten | - | Latin Name |
| Otadan | - | American Name | Otaktay | - | American Name |
| Othieno | - | African Name | Othni | - | Biblical Name |
| Othniel | - | Biblical Name | Otik | - | Czechoslovakian Name |
| Otis | - | German Name | Otoahhastis | - | American Name |
| Otoahnacto | - | American Name | Otoo | - | American Name |
| Ottah | - | Egyptian Name | Ottakoothan | - | Hindu Name |
| Ottakoothan | - | Indian Name | Otto | - | German Name |
| Oubastet | - | Egyptian Name | Ouray | - | American Name |
| Ovidiu | - | Romanian Name | Oviyan | - | Indian Name |
| Oviyan | - | Hindu Name | Owain | - | Arthurian Name |
| Owais | - | Muslim Name | Owen | - | Irish Name |
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