| Olai | Man | Scandinavian Names |
| Olav | Man | Scandinavian Names |
| Olavi | Man | Scandinavian Names |
| Ole | Man | Scandinavian Names |
| Olin | Man | Scandinavian Names |
| Olina | Woman | Scandinavian Names |
| Oline | Woman | Scandinavian Names |
| Olof | Man | Scandinavian Names |
| Olsen | Unisex | Scandinavian Names |
| Olson | Man | Scandinavian Names |
| Onni | Man | Scandinavian Names |
| Onnika | Woman | Scandinavian Names |
| Orn | Man | Scandinavian Names |
| Oslo | Unisex | Scandinavian Names |
| Ottilia | Woman | Scandinavian Names |
| Pala | Woman | Scandinavian Names |
| Peterson | Man | Scandinavian Names |
| Ponto | Man | Scandinavian Names |
| Pontus | Man | Scandinavian Names |
| Ragnar | Man | Scandinavian Names |