| Name | Meaning | Gender | Origin |
|---|
| Maisie | Pet form of Mairead | Female | Gaelic |
| Maisy | Pearl. Variant Of Margaret. | Unisex | English |
| Marvin | Uncertain, possibly eminent marrow | Male | Welsh |
| Mason | Bricklayer | Male | French |
| Maverick | Dissenter | Unisex | English |
| Max | Little Maximus | Male | Latin |
| Maximus | The greatest | Male | Latin |
| Meena | Fish | Female | Sanskrit |
| Memphis | City Of Moph | Female | Hebrew |
| Mickey | Who is like God? | Unisex | Hebrew |
| Mikey | Who is like God? | Unisex | Hebrew |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Mindy | Pet form of Melinda | Female | English |
| Minnie | Will, desire + helmet, protection | Female | Germanic |
| Mischief | One that causes minor trouble or disturbances | Unisex | English |
| Missy | Bee | Female | Greek |
| Misty | Misty | Female | English |
| Mita | Friend | Female | Sanskrit |
| Moe | Moor | Male | Latin |
| Mohan | Enchanting | Male | Sanskrit |
| Mohini | Charming | Female | Sanskrit |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Monster | A creature of frightening appearance | Unisex | English |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Mufasa | From The Lion King | Unisex | English |
| Muffin | A small cup shaped cake | Unisex | English |
| Munchkin | A very small elflike person. | Unisex | English |
| Murphy | Sea warrior | Male | Gaelic |
| Mya | Uncertain, perhaps mother or great one | Female | Greek |
| Mylo | Uncertain, perhaps peaceful | Unisex | Germanic |