| Name | Meaning | Gender | Origin |
|---|
| Manson | | Unisex | Hebrew |
| Marcy | From Marcella - Belonging to Mars. | Female | English |
| Margarita | Cocktail made with tequila and lemon or lime juice. | Female | Spanish |
| Marley | From the lake in the meadow | Female | English |
| Marley | From the lake in the meadow | Female | English |
| Marlo | Bitter | Female | American |
| Marshmellow | | Unisex | |
| Maui | | Unisex | |
| May | bitter | Female | English |
| Meadow | Meadow | Female | English |
| Meg | Pearl | Female | English |
| Melanie | Dark.
| Female | Greek |
| Meow | | Unisex | |
| Mercedes | Compassionate, merciful. | Female | Spanish |
| Mercy | compassion, pity | Female | English |
| Merry | Mirthful: joyous. Also an abbreviation of Meredith.
| Female | English |
| Mia | Mine | Female | Scandinavian |
| Mikey | | Unisex | |
| Miko | | Unisex | |
| Milky | | Female | |
| Millicent | after the character in D.C. Simpson's online comic Ozy and Millie | Female | |
| Millie | English, gentle strength | Female | English |
| Mimi | Form of Williamina
| Female | English |
| Mimi | Form of Williamina
| Female | English |
| Mina | Precious Stone | Female | Hindi |