| Name | Meaning | Gender | Origin |
|---|
| Malaika | Angel
| Female | |
| Malcolm Baddock | Slytherin student.
| Male | |
| Mallory | army counseler, without good fortune | Female | |
| Malvina | Smooth Brow | Female | Celtic |
| Maneet | Child with a good heart.
| Male | |
| Maniac | | Male | Hebrew |
| Mao | Egyptian for Cat | Male | |
| Marbles | Irregularly coloured rock. Balls usually made of glass used as a children's game. | Male | |
| Marge Dursley | Sister of Vernon Dursley.
| Female | |
| Mario | bitter, king-ruler | Male | Italian |
| Marley | From the lake in the meadow | Female | English |
| Marley | From the lake in the meadow | Female | English |
| Matilda | battle-mighty | Female | |
| Maximus | greatest | Male | Latin |
| Maxwell | Capable
| Male | Scottish |
| Maynard | Firm
| Male | |
| Megaton | | Male | |
| Mellow | | Unisex | Hebrew |
| Mercedes | Compassionate, merciful. | Female | Spanish |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Merlot | | Male | |
| Merry | Mirthful: joyous. Also an abbreviation of Meredith.
| Female | English |
| Midas | | Unisex | Hebrew |
| Midget | A small or miniature version | Unisex | |
| Mika | Abbreviation of Michaela:Micaela: Mikaela: Mikayla: Mychaela: Mikella. Feminine of Michael gift from God.
| Female | Japanese |