| Name | Meaning | Gender | Origin |
|---|
| Manu | Second born | Male | African |
| Marble | | Unisex | Hebrew |
| March | Boundary | Unisex | French |
| Marco | From the god Mars | Male | Latin |
| Marcos | From the god Mars | Male | Latin |
| Marmite | | Unisex | Hebrew |
| Matt | Gift of God | Male | Hebrew |
| Max | Little Maximus | Male | Latin |
| Maximus | The greatest | Male | Latin |
| Mayhem | | Unisex | Hebrew |
| Melancton | Black Flower | Male | Greek |
| Merlin | Sea fort | Male | Welsh |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Miko | Crimson truth | Male | Japanese |
| Miner | Miner | Male | English |
| Moonlight | | Unisex | Hebrew |
| Moonstruck | | Unisex | Hebrew |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Mopsy | Term of affection, a darling. | Unisex | English |
| Moritz | Moor | Unisex | Latin |
| Morris | Moor | Male | Latin |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | English |
| Moxie | Ability to face difficulty with courage. | Unisex | English |
| Muffin | A small cup shaped cake | Unisex | English |
| Muffy | | Unisex | Hebrew |
| Murphy | Sea warrior | Male | Gaelic |
| Napoleon | Sons of the mist, a race of dwarves | Male | Germanic |
| Nash | At the ash tree | Male | English |
| Ned | Wealth protector | Unisex | English |