| O?ulcan | - | Turkish Name | O?uzhan | - | Turkish Name |
| Oakes | - | English Name | Oaklee | - | Australian Name |
| Oakleigh | - | Australian Name | Oakley | - | English Name |
| Oaklie | - | English Name | Oaklyn | - | Welsh Name |
| Oaklynn | - | American Name | Oalik | - | Eskimo Name |
| Oalika | - | Eskimo Name | Oaluka | - | Eskimo Name |
| Oaluq | - | Eskimo Name | Oanaq | - | Eskimo Name |
| Oanaqa | - | Eskimo Name | Oanika | - | Eskimo Name |
| Oanuk | - | Eskimo Name | Oarvik | - | Eskimo Name |
| Oarvina | - | Eskimo Name | Oasik | - | Eskimo Name |
| Oasika | - | Eskimo Name | Oasis | - | United States Name |
| Oatuk | - | Eskimo Name | Oatuka | - | Eskimo Name |
| Oavik | - | Eskimo Name | Oavika | - | Eskimo Name |
| Oaya | - | African Name | Oazik | - | Eskimo Name |
| Oazika | - | Eskimo Name | Oba | - | Egyptian Name |
| Obaal | - | Phoenician Name | Obadiah | - | Aramaic Name |
| Obaid | - | Muslim Name | Obal | - | Biblical Name |
| Obalesh | - | Hindu Name | OBannon | - | English Name |
| Obasi | - | African Name | Obax | - | African Name |
| Obdulia | - | Philippines Name | Obed | - | Biblical Name |
| Obed-edom | - | Biblical Name | Obedience | - | American Name |
| Obehi | - | Nigerian Name |
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