| Name | Meaning | Gender | Origin |
|---|
| Malfoy | | Male | |
| Maniac | | Male | Hebrew |
| Mars | God Of War | Male | Latin |
| Marshmallow | A soft spongy sweet confectionery. Also a timid person. | Unisex | |
| Marvin | beautiful sea; good friend | Male | Welsh |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Maximillian | The greatest.
| Male | |
| Merlot | | Male | |
| Mia | Mine | Female | Scandinavian |
| Midnight | Intense darkness, the middle of the night | Male | English |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Mimi | Form of Williamina
| Female | English |
| Mimi | Form of Williamina
| Female | English |
| Mischa | Who Is Like G-D | Male | Hebrew |
| Miss Kitty | | Unisex | |
| Missy | Informal term for young woman | Female | English |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Mittens | | Unisex | |
| Molly | Bitter
| Female | English |
| Montague | steep mountain | Male | |
| Moses | saved; child; taken from water | Male | Egyptian |
| Muffin | A small cup shaped cake | Unisex | |