| Name | Meaning | Gender | Origin |
|---|
| Lollipop | | Unisex | |
| Lump | | Male | |
| Madden | Small Dog | Male | Irish |
| Maleah | Bitter | Unisex | American |
| Mansfield | From The Field By The Small River | Unisex | English |
| Marbles | Irregularly coloured rock. Balls usually made of glass used as a children's game. | Male | |
| Marlon | little hawk | Male | English |
| Marshmallow | A soft spongy sweet confectionery. Also a timid person. | Unisex | |
| Mickey | Abbreviation of Michael and Micah Who is like God?
| Male | English |
| Microbe | | Unisex | |
| Midget | A small or miniature version | Unisex | |
| Miette | Small Sweet Thing | Unisex | French |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Mini | Something smaller than others of its type | Unisex | |
| Mini | Something smaller than others of its type | Unisex | |
| Minni | | Unisex | |
| Moderation | | Unisex | |
| Molecule | | 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 | |
| Munchy | | Unisex | Hebrew |
| Mustard Seed | | Unisex | |
| Nacho | Small triangles of tortilla topped with cheese. | Male | Word |