| Name | Meaning | Gender | Origin |
|---|
| Macy | from Matthew's land; club | Female | English |
| Madison | son of a mighty warrior; son of Maud | Female | English |
| Maggie | Abbreviation of Margaret. A pearl.
| Female | English |
| Mango | after the character in Saturday Night Live | Unisex | |
| Marcie | Male | Female | English |
| Marley | From the lake in the meadow | Female | English |
| Marley | From the lake in the meadow | Female | English |
| Matilda | battle-mighty | Female | |
| Megan | mighty, strong able, pearl | Female | English |
| Mesha | ram, born under the sign of Aries | Unisex | |
| Mikie | Who Is Like God | Unisex | English |
| Mimi | Form of Williamina
| Female | English |
| Mimi | Form of Williamina
| Female | English |
| Minx | | Unisex | |
| Missy | Informal term for young woman | Female | English |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Mittens | | Unisex | |
| Molly | Bitter
| Female | English |
| Mookie | | Unisex | |
| Mullet | | Unisex | Hebrew |
| Muppet | | Unisex | Hebrew |
| Mushu | | Unisex | |
| Myra | sweet-smelling oil | Female | Greek |
| Nina | Girl
| Female | Russian |