| Name | Meaning | Gender | Origin |
|---|
| Lemon | | Unisex | Hebrew |
| Lightning | | Unisex | Hebrew |
| Lion | Lion | Unisex | English |
| LouLou | | Unisex | Hebrew |
| Maisy | | Unisex | |
| Maizey | | Unisex | |
| Maizy | Pearl | Unisex | Scottish |
| Mango | after the character in Saturday Night Live | Unisex | |
| Margarine | Pearl | Unisex | English |
| Marmalade | | Unisex | |
| Marshmallow | A soft spongy sweet confectionery. Also a timid person. | Unisex | |
| Marzipan | from the Flash cartoon Homestar Runner | Unisex | |
| Maxie | Greatest | Unisex | Italian |
| Mellow | | Unisex | Hebrew |
| Meringue | | Unisex | Hebrew |
| Mesi | Water | Unisex | Egyptian |
| Midas | | Unisex | Hebrew |
| Milly | Highborn Power | Unisex | English |
| Milly | Highborn Power | Unisex | English |
| Moon Unit | | Unisex | Hebrew |
| Moonshine | Moonlight or illegally distilled whiskey. | Unisex | |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | |
| Morning Glory | | Unisex | Hebrew |
| Muffin | A small cup shaped cake | Unisex | |
| Mustard | Seeds ground into paste and used as a spicy condiment | Unisex | |