| Name | Meaning | Gender | Origin |
|---|
| Maui | God of fire | Unisex | Hawaiian |
| Maverick | Dissenter | Unisex | English |
| Maximus | The greatest | Male | Latin |
| Maybell | Beautiful 5Th Month | Unisex | 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 |
| Milky | | Unisex | Hebrew |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Miracle | Wonder | Unisex | English |
| Miss | | Unisex | Hebrew |
| Mister | | Unisex | Hebrew |
| Mittens | | Unisex | Hebrew |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Mojo | Good luck charm. | Unisex | English |
| Monday | The second day of the week, following Sunday. | Unisex | English |
| Monster | A creature of frightening appearance | Unisex | English |
| Montana | Mountainous | Unisex | Latin |
| Moo | | Unisex | Hebrew |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | English |
| Mr. | | Unisex | Hebrew |
| Muffin | A small cup shaped cake | Unisex | English |
| Mutley | | Unisex | Hebrew |
| Myles | Uncertain, perhaps peaceful | Male | Germanic |
| Nana | Grace | Unisex | Hebrew |
| Nanook | Polar bear | Unisex | Native American |
| Napoleon | Sons of the mist, a race of dwarves | Male | Germanic |