| Name | Meaning | Gender | Origin |
|---|
| Lucy | Light | Female | Latin |
| Luke | Man from Lucania | Male | Greek |
| Lynx | Keepers of the secrets of the forests in mythology, also the name of a constellation in the Northern Hemisphere's sky | Both | English |
| Maddy | Pet form of Mad- names | Female | English |
| Madison | Son of Maud | Unisex | English |
| Maggie | Pearl | Female | Greek |
| Magic | Possessing qualities that produce baffling effects | Unisex | English |
| Magna | Thinking | Female | Indian |
| Magnolia | Magnol's flower | Female | Latin |
| Magnum | A large type of wine bottle. | Unisex | English |
| Mahogany | American evergreen tree valued for its hard, red-brown wood | Female | English |
| Majestic | | Unisex | Hebrew |
| Major | Greater | Male | Latin |
| Mango | After the character in Saturday Night Live | Unisex | English |
| Manny | God is with us | Male | Hebrew |
| Marcus | From the god Mars | Male | Latin |
| Marigold | Golden Mary | Female | English |
| Marilyn | Uncertain, maybe bitter | Female | Hebrew |
| Marley | Pleasant wood | Female | English |
| Marvin | Uncertain, possibly eminent marrow | Male | Welsh |
| Mason | Bricklayer | Male | French |
| Matilda | Powerful battler | Female | Germanic |
| Max | Little Maximus | Male | Latin |
| Maxie | Pet form of names starting with Max | Unisex | English |
| Maxwell | Maccus's stream | Male | English |
| Maxx | Greatest | Unisex | English |
| Maya | Uncertain, perhaps mother or great one | Female | Greek |
| Meka | Eyes | Male | English |
| Melina | Honey | Female | Greek |
| Mia | Uncertain, maybe bitter | Female | Hebrew |