| Name | Meaning | Gender | Origin |
|---|
| Logan | Hollow | Unisex | Gaelic |
| Lou | Fame and war | Male | Germanic |
| Louie | Fame and war | Male | Germanic |
| Louis | Fame and war | Male | Germanic |
| Lucas | Man from Lucania | Male | Greek |
| Lucky | Fortunate | Unisex | English |
| Luke | Man from Lucania | Male | Greek |
| Mac | Son of | Male | Gaelic |
| Mackenzie | Son of Coinneach | Male | Gaelic |
| Macy | Place of Maccius | Male | English |
| Maddie | Pet form of Mad- names | Unisex | English |
| Madison | Son of Maud | Unisex | English |
| Magic | Possessing qualities that produce baffling effects | Unisex | English |
| Major | Greater | Male | Latin |
| Mango | After the character in Saturday Night Live | Unisex | English |
| Marble | | Unisex | Hebrew |
| Mason | Bricklayer | Male | French |
| Maverick | Dissenter | Unisex | English |
| Max | Little Maximus | Male | Latin |
| Maximus | The greatest | Male | Latin |
| Maxwell | Maccus's stream | Male | English |
| Merlin | Sea fort | Male | Welsh |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mikey | Who is like God? | Unisex | Hebrew |
| Miko | Crimson truth | Male | Japanese |
| Miles | Uncertain, perhaps peaceful | Male | Germanic |
| Miller | Grinder of grain | Male | English |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Mini | Something smaller than others of its type | Unisex | English |