| Name | Meaning | Gender | Origin |
|---|
| Loretta | Pure
| Female | English |
| Lucita | Little light
| Female | |
| Lulu | Pet form of the names Louise or Louella.
| Female | English |
| Lump | | Male | |
| Madden | Small Dog | Male | Irish |
| Maleah | Bitter | Unisex | American |
| Mandarin | A high official of Imperial China. Also a small orange or tangerine like fruit. | Female | |
| Mansfield | From The Field By The Small River | Unisex | English |
| Manya | Bitter
| Female | |
| 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 | |
| Mavis | a small bird | Female | |
| Mickey | Abbreviation of Michael and Micah Who is like God?
| Male | English |
| Microbe | | Unisex | |
| Midge | Gnat like flies found near swamps. A little person | Female | English |
| Midget | A small or miniature version | Unisex | |
| Miette | Small Sweet Thing | Unisex | French |
| Miki | beautiful tree | Female | Japanese |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| 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 | |