| Otoahnacto | - | American Name | Otong | - | Indonesian Name |
| Otoo | - | American Name | Ottah | - | Egyptian Name |
| Ottakoothan | - | Indian Name | Ottakoothan | - | Hindu Name |
| Ottar | - | Norse Name | Otto | - | German Name |
| Oubastet | - | Egyptian Name | Oumar | - | Cameroon Name |
| Oumik | - | Eskimo Name | Ouray | - | American Name |
| Ousmane | - | Cameroon Name | Ouvik | - | Eskimo Name |
| Ovadiah | - | Aramaic Name | Ovelin | - | Cyprien Name |
| Ovid | - | Cameroon Name | Ovídio | - | Portuguese Name |
| Ovidiu | - | Romanian Name | Oviyan | - | Indian Name |
| Oviyan | - | Hindu Name | Ovsiy | - | Ukrainian Name |
| Owain | - | Arthurian Name | Owais | - | Muslim Name |
| Owen | - | English Name | Owolabi | - | Cameroon Name |
| Oxford | - | United States Name | Oya | - | American Name |
| Oyekunle | - | Cameroon Name | Oytun | - | Turkish Name |
| Oz | - | United States Name | Ozal | - | Phoenician Name |
| Ozan | - | Turkish Name | Ozbaal | - | Phoenician Name |
| Ozbael | - | Phoenician Name | Ozdemir | - | Turkish Name |
| Ozden | - | Turkish Name | Ozeil | - | West Indies Name |
| Ozem | - | Biblical Name | Ozer | - | Yiddish Name |
| Ozerke | - | Yiddish Name | Ozias | - | Biblical Name |
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