| Name | Meaning | Gender | Origin |
|---|
| Lady | Lady | Unisex | English |
| Lennon | Descendant of Leannán or Lonán | Male | Gaelic |
| Leon | Lion | Male | Latin |
| Liam | Will, desire and helmet, protection | Male | Germanic |
| Liquorice | | Unisex | Hebrew |
| Lucius | Light | Male | Latin |
| Lucky | Fortunate | Unisex | English |
| Madame | | Unisex | Hebrew |
| Magic | Possessing qualities that produce baffling effects | Unisex | English |
| Manco | Foundation | Male | Native American |
| Mandek | Righteous | Male | Polish |
| Manning | Descendent of MainnÃn | Male | Gaelic |
| Mannix | Little monk | Male | Gaelic |
| Marmite | | Unisex | Hebrew |
| Mather | Mower | Male | English |
| Maurice | Moor | Male | Latin |
| Max | Little Maximus | Male | Latin |
| Maxwell | Maccus's stream | Male | English |
| Mel | Uncertain, possibly bad town | Unisex | English |
| Melik | | Male | Hebrew |
| Merlin | Sea fort | Male | Welsh |
| Merrick | Moor | Male | Welsh |
| Micheal | Form Of Michael Who Is Like God? | Unisex | English |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Miko | Crimson truth | Male | Japanese |
| Miles | Uncertain, perhaps peaceful | Male | Germanic |
| Mittens | | Unisex | Hebrew |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Mohan | Enchanting | Male | Sanskrit |
| Moonlight | | Unisex | Hebrew |