| Name | Meaning | Gender | Origin |
|---|
| Major | Greater | Male | Latin |
| Mako | Child of truth | Unisex | Japanese |
| Makoto | Sincerity | Male | Japanese |
| Malakai | My messenger | Male | Hebrew |
| Mamoru | Protect | Male | Japanese |
| Manley | Common clearing | Male | English |
| Mara | Bitter | Female | Hebrew |
| Mariko | Child of true reason | Female | Japanese |
| Marlee | Contraction of Maria Magdalene | Female | German |
| Marley | Pleasant wood | Female | English |
| Marmaduke | Devotee of Maedoc | Male | Gaelic |
| Masako | Proper child | Female | Japanese |
| 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 |
| Maximus | The greatest | Male | Latin |
| Maya | Uncertain, perhaps mother or great one | Female | Greek |
| Mayhem | | Unisex | Hebrew |
| Meadow | A meadow | Female | English |
| Mei | The youngest of sisters | Female | Chinese |
| Mercedes | Mercies | Female | Spanish |
| Mercy | Compassion | Female | English |
| Merlin | Sea fort | Male | Welsh |
| Michi | Route | Female | Japanese |
| Michiko | Beautiful wise child | Female | Japanese |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Midori | Green | Female | Japanese |
| Mieko | Child blessed with beauty | Female | Japanese |