| Name | Meaning | Gender | Origin |
|---|
| Mimi | Form of Williamina
| Female | English |
| Ming | shining bright | Male | Chinese |
| Mini | Something smaller than others of its type | Unisex | |
| Mini | Something smaller than others of its type | Unisex | |
| Minnie | Form of Williamina
| Female | English |
| Minnow | | Unisex | |
| Mischief | One that causes minor trouble or disturbances | Male | |
| Mishka | Russian for little bear | Unisex | |
| Miss Kitty | | Unisex | |
| Missy | Informal term for young woman | Female | English |
| Mister | | Male | |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Mittens | | Unisex | |
| Mitzi | bitter | Female | |
| Mitzy | | Unisex | |
| Mocha | Coffee of high quality. | Female | Arabic |
| Mojo | Good luck charm. | Unisex | |
| Molly | Bitter
| Female | English |
| Momo | gangster from the movie Get Shorty | Unisex | |
| Momo | Peach | Unisex | Japanese |
| Monkey | | Unisex | |
| Monster | A creature of frightening appearance | Unisex | |
| Moo Moo | | Unisex | |
| Morgan | circle; sea | Female | Welsh |