| Olivine | - | West Indies Name | Olivya | - | Latin Name |
| Olka | - | Ukrainian Name | Ollie | - | American Name |
| Olono | - | Aborigin Name | Olrun | - | Norse Name |
| Olufemi | - | Finnish Name | Olusha | - | Ukrainian Name |
| Oluwafunmilayo | - | Cameroon Name | Oluwakemi | - | Cameroon Name |
| Olvia | - | Assyrian Name | Olwyn | - | Arthurian Name |
| Olwynn | - | Welsh Name | Olyana | - | Assyrian Name |
| Olympas | - | Biblical Name | Olympia | - | Greek Name |
| Olyvia | - | Australian Name | Ólöf | - | Icelandic Name |
| Oma | - | Muslim Name | Omaima | - | Assyrian Name |
| Omaira | - | Indonesian Name | Omaja | - | Hindu Name |
| Omala | - | Indian Name | Omala | - | Hindu Name |
| Omana | - | Indian Name | Omara | - | Assyrian Name |
| Omaria | - | Arabic Name | Omariyah | - | West Indies Name |
| Omayda | - | Italian Name | Omega | - | Muslim Name |
| Omelia | - | Ukrainian Name | Omera | - | Muslim Name |
| Omilade | - | West Indies Name | Omisha | - | Hindu Name |
| Omkareshwari | - | Indian Name |
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