| Name | Meaning | Gender | Origin |
|---|
| Layla | night | Female | Arabic |
| Leila | dark as the night | Female | Persian |
| Leslie | dweller in the gray castle; small meadow | Female | Scottish |
| Lilith | character in Cheers | Female | Assyrian |
| Lisha | Noble, Kind | Unisex | English |
| Lloyd | gray | Male | Welsh |
| Mahogany | American evergreen tree valued for its hard, red-brown wood | Female | Spanish |
| Maura | Great | Female | Scottish |
| Maureen | Bitter | Female | Irish |
| Maurice | moorish; dark; moor land | Male | Latin |
| Melania | black | Female | Spanish |
| Melanie | Dark.
| Female | Greek |
| Melinda | Blend of Melissa and Linda.
| Female | English |
| Merrick | ruler of the sea | Male | Anglo-Welsh |
| Midnight | Intense darkness, the middle of the night | Male | English |
| Mindy | From Minta - Remembered with love | Female | English |
| Mo | bitter | Female | English |
| Moe | delivered | Male | English |
| Moritz | Dark Skinned | Unisex | German |
| Morris | dark-skinned | Male | English |
| Morrison | Maurice's son | Male | English |
| Morse | after Inspector Morse | Unisex | |
| Morticia | Addams family | Female | |
| Night | | Male | |
| Noire | | Unisex | |