| Name | Meaning | Gender | Origin |
|---|
| Mack | Son of
| Male | Scottish |
| Marmalade | | Unisex | |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Maximus | greatest | Male | Latin |
| Meowmeow | | Unisex | |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Mickey | Abbreviation of Michael and Micah Who is like God?
| Male | English |
| Midnight | Intense darkness, the middle of the night | Male | English |
| Milkshake | | Male | |
| Milly | Highborn Power | Unisex | English |
| Milly | Highborn Power | Unisex | English |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Mischief | One that causes minor trouble or disturbances | Male | |
| Mishka | Russian for little bear | Unisex | |
| Mittens | | Unisex | |
| Monty | From Montgomer - The mountain hunter. | Male | English |
| Muffin | A small cup shaped cake | Unisex | |
| Muffy | | Unisex | |
| Neville | from the new farmland | Male | |
| Nikki | Victorious People | Unisex | English |
| Niko | victory of the people | Male | Greek |
| Nipper | A small boy | Unisex | |
| Norman | man from the north | Male | English |