| Name | Meaning | Gender | Origin |
|---|
| Madame Hooch | The quidditch teacher at Hogwarts.
| Female | |
| Maddox | Beneficient | Male | Welsh |
| Maggie | Abbreviation of Margaret. A pearl.
| Female | English |
| Magnificat | Variation on magnificent - Splendid in appearance. | Male | |
| Magnum | A large type of wine bottle. | Unisex | |
| Mahmood | Praised | Unisex | Persian |
| Mahnoosh | | Unisex | |
| Mahon | Bear | Unisex | Irish |
| Maia | nurse, mother, goddess of spring; great | Female | Greek |
| Mairead | Name of a saint
| Female | Irish |
| Mairia | Bitter
| Female | |
| Maitilde | Strong battle maiden
| Female | |
| Maiya | Beautiful forever.
| Female | |
| Majella | Name of a saint
| Female | |
| Malichi | | Unisex | Hebrew |
| Mandarin | A high official of Imperial China. Also a small orange or tangerine like fruit. | Female | |
| Maneet | Child with a good heart.
| Male | |
| Mansfield | From The Field By The Small River | Unisex | English |
| Mansoor | Defended, Protected By G-D | Unisex | Persian |
| 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 | |
| Marshal Jake | | Unisex | |
| Marshmallow | A soft spongy sweet confectionery. Also a timid person. | Unisex | |
| Martika | | Unisex | |