| Nyra | - | Norse Name | Nyree | - | American Name |
| Nysa | - | Australian Name | Nysha | - | Australian Name |
| Nyssa | - | Muslim Name | Nyssia | - | Cyprien Name |
| Nysted | - | Norse Name | Nyura | - | Ukrainian Name |
| Nyx | - | Australian Name | Nüzhet | - | Turkish Name |
| Nönnu | - | Icelandic Name | 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 |
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