| Name | Meaning | Gender | Origin |
|---|
| Maeve | goddess; a purple flower | Female | Irish |
| Magic | Possessing qualities that produce baffling effects | Male | Word |
| Magic | Possessing qualities that produce baffling effects | Male | Word |
| Magpie | | Unisex | |
| Marigold | a flower | Female | |
| Marmalade | | Unisex | |
| Mary | bitter | Female | Hebrew |
| Matilda | battle-mighty | Female | |
| Medusa | Guardian | Unisex | Latin |
| Melanie | Dark.
| Female | Greek |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Michael | who is like God | Male | Hebrew |
| Midnight | Intense darkness, the middle of the night | Male | English |
| Mina | Precious Stone | Female | Hindi |
| Mischief | One that causes minor trouble or disturbances | Male | |
| Misery | | Unisex | Hebrew |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Monster | A creature of frightening appearance | Unisex | |
| Moon | Moon | Female | American |
| Moondust | | Unisex | Hebrew |
| Moonie | after the late drummer/hotel-room-wrecker Keith Moon | Unisex | |
| Moonlight | | Unisex | |
| Moonlight | | Unisex | |
| Mordred | Brave | Unisex | English |