| Name | Meaning | Gender | Origin |
|---|
| Lilac | Lilac flower | Female | French |
| Lilly | Lily | Female | English |
| Ling | Delicate | Female | Chinese |
| Lola | Sorrows | Female | Spanish |
| Lovie | Loved One | Female | English |
| Luca | Man from Lucania | Unisex | Greek |
| Lucie | Light | Female | Latin |
| Lucky | Fortunate | Unisex | English |
| Lucy | Light | Female | Latin |
| 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 |
| Mango | After the character in Saturday Night Live | Unisex | English |
| Marigold | Golden Mary | Female | English |
| Marilyn | Uncertain, maybe bitter | Female | Hebrew |
| Marley | Pleasant wood | Female | English |
| Matilda | Powerful battler | Female | Germanic |
| Maxie | Pet form of names starting with Max | Unisex | English |
| Maxx | Greatest | Unisex | English |
| Maya | Uncertain, perhaps mother or great one | Female | Greek |
| Melina | Honey | Female | Greek |
| Mia | Uncertain, maybe bitter | Female | Hebrew |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |