| Oaklee | - | Australian Name | Oakleigh | - | Australian Name |
| Oakley | - | United States Name | Oaklyn | - | Welsh Name |
| Oaklynn | - | American Name | Oalika | - | Eskimo Name |
| Oaluka | - | Eskimo Name | Oanaqa | - | Eskimo Name |
| Oanika | - | Eskimo Name | Oarvina | - | Eskimo Name |
| Oasika | - | Eskimo Name | Oasis | - | United States Name |
| Oatuka | - | Eskimo Name | Oavika | - | Eskimo Name |
| Oaya | - | African Name | Oazika | - | Eskimo Name |
| Oba | - | Cameroon Name | Obax | - | African Name |
| Obdulia | - | Philippines Name | Obehi | - | Nigerian Name |
| Obetia | - | Philippines Name | Obil | - | Biblical Name |
| Ocean | - | Greek Name | Oceana | - | Greek Name |
| Oceanna | - | Greek Name | Ochy | - | Indonesian Name |
| Octavia | - | Romanian Name | October | - | Latin Name |
| Oda | - | Norse Name | Odahingum | - | American Name |
| Odalis | - | American Name | Odathi | - | Indian Name |
| Odathi | - | Hindu Name | Oddný | - | Icelandic Name |
| Oddny | - | Norse Name | Ode | - | Egyptian Name |
| Odel | - | Aramaic Name | Odela | - | Yiddish Name |
| Odele | - | United States Name | Odeleh | - | Yiddish Name |
| Odelia | - | Anglo Name |
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