| Name | Meaning | Gender | Origin |
|---|
| Marble | | Unisex | |
| Marmalade | | Unisex | |
| Mars | God Of War | Male | Latin |
| Marshmallow | A soft spongy sweet confectionery. Also a timid person. | Unisex | |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| 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 |
| Midnite | | Unisex | |
| Miles | of smiles | Male | Latin |
| Milly | Highborn Power | Unisex | English |
| Milly | Highborn Power | Unisex | English |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Ming | shining bright | Male | Chinese |
| Mini | Something smaller than others of its type | Unisex | |
| Mini | Something smaller than others of its type | Unisex | |
| Minnow | | Unisex | |
| Mischief | One that causes minor trouble or disturbances | Male | |
| Mishka | Russian for little bear | Unisex | |
| Miss Kitty | | Unisex | |
| Mister | | Male | |
| Mittens | | Unisex | |
| Mitzy | | Unisex | |