| Olive | Woman | English Names |
| Oliver | Man | English Names |
| Olivera | Woman | English Names |
| Olivette | Woman | French Names |
| Olivia | Woman | English Names |
| Olivie | Woman | Slavic - Czech Names |
| Olivier | Man | French Names |
| Olliana | Woman | Hawaiian Names |
| Ollie | Man | English Names |
| Olof | Man | Scandinavian Names |
| Olsen | Unisex | Scandinavian Names |
| Olson | Man | Scandinavian Names |
| Oluina | Woman | African - Ovimbundu of Angola Names |
| Olujimi | Man | African - Yoruba Names |
| Oluremi | Woman | African Names |
| Olwen | Woman | Welsh Names |
| Olya | Woman | Slavic Names |
| Olympe | Woman | French Names |
| Olympia | Woman | Greek Names |
| Oma | Man | Arabic Names |