| Name | Meaning | Gender | Origin |
|---|
| Mungo | my pet | Male | Scottish |
| Mungojerrie | | Unisex | Hebrew |
| Munkustrap | | Unisex | Hebrew |
| Murphy | Sea warrior | Male | Irish |
| Murray | The mariner, sailor | Male | Scottish |
| Mut | Mother | Unisex | Egyptian |
| Myrtle | a flower, symbol of victory | Female | Greek |
| Nacho | Small triangles of tortilla topped with cheese. | Male | Word |
| Nathan | given | Male | Hebrew |
| Nelly | Abbreviation of Eleanor shining light.
| Male | English |
| Nelson | son of a champion, son of Neil | Male | English |
| Nermal | | Unisex | |
| Neutron | | Unisex | Hebrew |
| Nin | | Male | |
| Nip | | Unisex | |
| Noel | Christmas
| Male | |
| Noodles | | Male | |
| Nora | Abbreviation of Eleanora light and Honora honor.
| Female | Irish |
| Norton | From the north farm
| Male | English |
| Old Deuteronomy | | Unisex | Hebrew |
| Oliver | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace.
| Male | Latin |
| Ollie | Latin, olive tree | Male | English |
| Omaha | | Unisex | Hebrew |
| Orion | Son of Fire
| Male | Greek |
| Oscar | God's spear.
| Male | English |