| Name | Meaning | Gender | Origin |
|---|
| Milagritos | Miracle
| Female | |
| Miley | A Soldier, Merciful | Female | Latin |
| Milkshake | | Male | |
| Millie | English, gentle strength | Female | English |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Mimi | Form of Williamina
| Female | English |
| Mimi | Form of Williamina
| Female | English |
| Minnie | Form of Williamina
| Female | English |
| Miss Kitty | | Unisex | |
| Missy | Informal term for young woman | Female | English |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Mitsy | | Unisex | Hebrew |
| Mittens | | Unisex | |
| Mocha | Coffee of high quality. | Female | Arabic |
| Molara | Reference to the Virgin Mary
| Female | |
| Mollie | Bitter | Unisex | English |
| Molly | Bitter
| Female | English |
| Moon | Moon | Female | American |
| Mopsy | Term of affection, a darling. | Unisex | |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | |
| Muffin | A small cup shaped cake | Unisex | |
| Munchkin | A very small elflike person. | Unisex | |
| Murphy | Sea warrior | Male | Irish |