| Name | Meaning | Gender | Origin |
|---|
| Luna | Moon | Female | Latin |
| Maggie | Pearl | Female | Greek |
| Magnum | A large type of wine bottle. | Unisex | English |
| Majestic | | Unisex | Hebrew |
| Major | Greater | Male | Latin |
| Mako | Child of truth | Unisex | Japanese |
| Malakai | My messenger | Male | Hebrew |
| Manley | Common clearing | Male | English |
| Mara | Bitter | Female | Hebrew |
| Marlee | Contraction of Maria Magdalene | Female | German |
| Marley | Pleasant wood | Female | English |
| Marmaduke | Devotee of Maedoc | Male | Gaelic |
| Maui | God of fire | Unisex | Hawaiian |
| Maverick | Dissenter | Unisex | English |
| Max | Little Maximus | Male | Latin |
| Maxi | Pet form of names starting with Max | Unisex | English |
| Maya | Uncertain, perhaps mother or great one | Female | Greek |
| Mercedes | Mercies | Female | Spanish |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mighty | | Unisex | Hebrew |
| Mignon | Cute | Female | French |
| Mika | Beautiful smell | Female | Japanese |
| Missy | Bee | Female | Greek |
| Misty | Misty | Female | English |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Mozart | | Unisex | Hebrew |
| Murphy | Sea warrior | Male | Gaelic |
| Natalie | Christ's birthday | Female | Italian |