| Name | Meaning | Gender | Origin |
|---|
| Maia | nurse, mother, goddess of spring; great | Female | Greek |
| Manhattan | Whiskey | Unisex | |
| Mann | Hero | Unisex | English |
| Martian | | Unisex | Hebrew |
| Maui | | Unisex | |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Maximus | greatest | Male | Latin |
| Maxx | Greatest | Unisex | English |
| Maya | Abbreviation of Amalia: variant of Maia.
| Female | Hebrew |
| Maynard | Firm
| Male | |
| Meg | Pearl | Female | English |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Millicent | after the character in D.C. Simpson's online comic Ozy and Millie | Female | |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Mingus | tenants of a manor | Male | Scottish |
| Monger | | Unisex | Hebrew |
| Monroe | mouth of the Roe River; wheelwright | Female | Scottish |
| Monroe | mouth of the Roe River; wheelwright | Female | Scottish |
| Montana | Mountain. | Male | Spanish |
| Monty | From Montgomer - The mountain hunter. | Male | English |
| Morpheus | Dream God | Male | Greek |
| Morrissey | descendant of Muiris | Male | Irish |
| Mystique | Air of mystery.
| Female | |