| Name | Meaning | Gender | Origin |
|---|
| Midget | A small or miniature version | Unisex | |
| Miette | Small Sweet Thing | Unisex | French |
| Miki | beautiful tree | Female | Japanese |
| Minette | Form of Williamina
| Female | |
| Mini | Something smaller than others of its type | Unisex | |
| Mini | Something smaller than others of its type | Unisex | |
| Minni | | Unisex | |
| Minnie | Form of Williamina
| Female | English |
| Missy | Informal term for young woman | Female | English |
| Mitzi | bitter | Female | |
| Moderation | | Unisex | |
| Molecule | | Unisex | |
| Molly | Bitter
| Female | English |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | |
| Moxie | Ability to face difficulty with courage. | Female | English |
| Muffin | A small cup shaped cake | Unisex | |
| Munchkin | A very small elflike person. | Unisex | |
| Munchy | | Unisex | Hebrew |
| Musetta | a ballad | Female | Latin |
| Mustard Seed | | Unisex | |
| Needles | A small slender instrument used for sewing. | Unisex | |
| Nibbles | | Unisex | |
| Nina | Girl
| Female | Russian |
| Nipper | A small boy | Unisex | |
| Nugget | as in Chicken | Unisex | |