| Name | Meaning | Gender | Origin |
|---|
| Morgana | sea-circle | Female | Female |
| Morticia | Addams family | Female | |
| Munster | | Unisex | Hebrew |
| Mystery | Mystery | Female | English |
| Mystic | | Unisex | Hebrew |
| Naranja | Spanish for orange | Unisex | |
| Nebula | misty | Female | Latin |
| Nero | stern | Male | Latin |
| Night | | Male | |
| Nightmare | A dream of intense fear or horror. | Unisex | |
| Nightshade | | Unisex | Hebrew |
| Ninja | | Male | |
| Noir | | Unisex | |
| Noire | | Unisex | |
| Norman | man from the north | Male | English |
| Nosferatu | | Unisex | |
| Nox | latin for night | Unisex | |
| Nyx | Greek goddess of night | Female | Greek |
| Obsidian | | Unisex | |
| October | eighth | Female | Latin |
| Odin | Viking mythology: the allmighty god | Male | Old |
| Omen | | Male | |
| Onyx | A gemstone with bands of different colours. | Male | |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |