| Name | Meaning | Gender | Origin |
|---|
| Lotta | | Female | |
| Lotti | | Female | |
| Lou | Famous Warrior | Male | English |
| Louis | famed warrior | Male | |
| Lucas | Form of Luke light: illumination.
| Male | Latin |
| Lucy | light: illumination.
| Female | English |
| Luis | Famous fighter
| Male | |
| Lupin | | Male | Hebrew |
| Lyubov | Love. Alternate Spellings: Lyuba or Luba.
| Female | |
| Mac | Son of
| Male | Scottish |
| Macbeth | Son of Beth
| Male | |
| Macey | Gift Of G-D | Unisex | French |
| MacKenzie | Child of the wise leader
| Female | Scottish |
| Madame Hooch | The quidditch teacher at Hogwarts.
| Female | |
| Madame Pince | The Hogwarts librarian.
| Female | |
| Madelene | From the tower
| Female | |
| Madison | son of a mighty warrior; son of Maud | Female | English |
| Madonna | my lady | Female | Latin |
| Maggie | Abbreviation of Margaret. A pearl.
| Female | English |
| Magna | Large | Unisex | Latin |
| Magnilde | Strong battle maiden
| Female | |
| Mahogany | American evergreen tree valued for its hard, red-brown wood | Female | Spanish |
| Maiti | Strong battle maiden
| Female | |
| Maitilda | Strong battle maiden
| Female | |
| Maitilde | Strong battle maiden
| Female | |