| Name | Meaning | Gender | Origin |
|---|
| Morse | after Inspector Morse | Unisex | |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | |
| Mousse | | Unisex | |
| Mud | | Unisex | Hebrew |
| Muse | | Female | |
| Myth | | Unisex | Hebrew |
| Nash | cliff | Male | English |
| Nat | Hebrew, given | Male | English |
| Nate | Hebrew, given | Male | English |
| Ned | wealthy guardian | Male | English |
| Nell | Abbreviation of Eleanor shining light.
| Female | English |
| Nels | Greek, people of victory | Male | Norwegian |
| Newt | a small salamander | Male | English |
| Nick | Variation of Dominic, belonging to the Lord | Male | English |
| Nike | victory | Male | Greek |
| Nils | After Nils Master, brand of fishing lure | Male | Norwegian |
| Nip | | Unisex | |
| Norm | From The North | Unisex | English |
| North | from the north | Male | Word |
| Nudge | To push against gently. One who pesters. | Unisex | |
| Nymph | | Unisex | |
| Oakes | from the oak-tree grove | Male | English |
| Oats | | Unisex | |
| Ox | | Unisex | Hebrew |
| Oy | | Unisex | Hebrew |