| Ninos | | - | Ancient Near Eastern (Hellenized) | |
| NjÁLl | | - | Norse Mythology, Ancient Scandinavian, Icelandic | |
| Nona (2) | | - | English, Ancient Roman (Rare) | |
| Nonus | | - | Ancient Roman (Rare) | |
| Norbert | | NAWR-bert (German, Polish), NAWR-bərt (English, Dutch) | German, English, Dutch, French, Hungarian, Polish, Ancient Germanic | |
| Norman | | NAWR-mən (English) | English, Ancient Germanic | |
| NuallÁN | | - | Ancient Irish | |
| Nymphodora | | - | Ancient Greek | |
| Nynniaw | | - | Ancient Celtic | |
| Octavia | | ahk-TAYV-ee-ə (English) | English, Spanish, Ancient Roman | |
| Octavianus | | - | Ancient Roman | |
| Octavius | | ahk-TAYV-ee-əs (English) | Ancient Roman | |
| Oda | | O-dah (German) | German, Ancient Germanic | |
| Odalric | | - | Ancient Germanic | |
| Oddr | | - | Ancient Scandinavian | |