| Name | Meaning | Gender | Origin |
|---|
| Majestic | | Unisex | Hebrew |
| Marley | From the lake in the meadow | Female | English |
| Marley | From the lake in the meadow | Female | English |
| Marmite | | Unisex | |
| Matches | | Unisex | Hebrew |
| Maverick | One that dissents from the group. | Male | American |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Maximus | greatest | Male | Latin |
| Meowmeow | | Unisex | |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Merlot | | Male | |
| Michelle | Feminine of Michael | Female | |
| Mickey | Abbreviation of Michael and Micah Who is like God?
| Male | English |
| Midnight | Intense darkness, the middle of the night | Male | English |
| Milkshake | | Male | |
| Millie | English, gentle strength | Female | English |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Ming | shining bright | Male | Chinese |
| Minnie | Form of Williamina
| Female | English |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Mittens | | Unisex | |
| Mocha | Coffee of high quality. | Female | Arabic |