| Name | Meaning | Gender | Origin |
|---|
| Lotus | freamlike, lotus flower | Female | Greek |
| LouLou | | Unisex | Hebrew |
| Lucky | Having good luck. | Male | Word |
| Lucy | light: illumination.
| Female | English |
| Lulu | Pet form of the names Louise or Louella.
| Female | English |
| Luna | moon | Female | Latin |
| Lynx | | Male | |
| Mabel | my fair maid; lovely | Female | English |
| Macavity | | Unisex | |
| Maddie | Of Magdala | Female | English |
| Mango | after the character in Saturday Night Live | Unisex | |
| Marvin | beautiful sea; good friend | Male | Welsh |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Maximus | greatest | Male | Latin |
| Maxine | greatest | Female | Latin |
| Maxwell | Capable
| Male | Scottish |
| McKinley | | Female | Hebrew |
| Meggie | Pearl | Unisex | English |
| Mel | Scottish, settlement on infertile land | Male | English |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Mewy | | Unisex | |
| Mia | Mine | Female | Scandinavian |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |