| Oakes | - | English Name | Oaklee | - | Australian Name |
| Oakleigh | - | Australian Name | Oakley | - | English Name |
| Oaklie | - | English Name | Oaklyn | - | Welsh Name |
| Oaklynn | - | American Name | Oaya | - | African Name |
| Oba | - | Egyptian Name | Obadiah | - | Biblical Name |
| Obaid | - | Muslim Name | Obal | - | Biblical Name |
| Obalesh | - | Hindu Name | OBannon | - | English Name |
| Obasi | - | African Name | Obax | - | African Name |
| Obed | - | Biblical Name | Obed-edom | - | Biblical Name |
| Obedience | - | American Name | Obehi | - | Nigerian Name |
| Obi | - | African Name | Obiajulu | - | African Name |
| Obike | - | American Name | Obil | - | Biblical Name |
| Oboth | - | Biblical Name | Ocean | - | Greek Name |
| Oceana | - | Greek Name | Oceanna | - | Greek Name |
| Ociel | - | Latin Name | Ocran | - | Biblical Name |
| Octavia | - | Romanian Name | Octavian | - | Romanian Name |
| Octha | - | Arthurian Name | October | - | Latin Name |
| Ocumwhowurst | - | American Name | Ocunnowhurst | - | American Name |
| Ocvran | - | Arthurian Name | Odahingum | - | American Name |
| Odakota | - | American Name | Odakuta | - | American Name |
| Odalis | - | American Name | Odathi | - | Hindu Name |
| Odathi | - | Indian Name | Odd | - | Norse Name |
| Ode | - | Egyptian Name | Oded | - | Biblical Name |
| Odelia | - | Anglo Name | Odern | - | Aborigin Name |
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