| Norman | Man | English Names |
| Norris | Unisex | English Names |
| North | Unisex | English Names |
| Norton | Man | English Names |
| Norwood | Man | English Names |
| Nowles | Unisex | English Names |
| Nubia | Woman | English Names |
| Nyla | Woman | English Names |
| Oakes | Unisex | English Names |
| Oakley | Unisex | English Names |
| Obedience | Woman | English Names |
| Ode | Unisex | English Names |
| Odell | Unisex | English Names |
| Odo | Man | English Names |
| Ogden | Man | English Names |
| Oliva | Woman | English Names |
| Olive | Woman | English Names |
| Oliver | Man | English Names |
| Olivera | Woman | English Names |
| Olivia | Woman | English Names |