| Name | Meaning | Gender | Origin |
|---|
| Lucius | Light | Male | Roman |
| Lucy | light: illumination.
| Female | English |
| Ludo | after the character in the movie Labyrinth | Unisex | |
| Lydia | woman from Persia, beauty | Female | Greek |
| Mabel | my fair maid; lovely | Female | English |
| Madeleine | From the tower
| Female | |
| Madeline | woman from Magdala, one who is elevated, a high tower | Female | English |
| Maisie | child of light | Female | Scottish |
| Marcus | warlike | Male | Latin |
| Margaret | after Margaret Thatcher | Female | Greek |
| Maria | bitter | Female | Latin |
| Marianna | Bitter, Gracious | Female | English |
| Marianne | little Mary | Female | |
| Marie | Bitter
| Female | |
| Marina | sea maiden | Female | Latin |
| Marmaduke | leader of the seas | Male | Irish |
| Marnie | rejoice | Female | English |
| Marshall | Man who looks after a nobleman's estate, keeper of the horses; steward | Male | |
| Martha | a lady | Female | Aramaic |
| Mary | bitter | Female | Hebrew |
| Matilda | battle-mighty | Female | |
| Maud | strength in battle | Female | English |
| Maurice | moorish; dark; moor land | Male | Latin |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |