| Name | Meaning | Gender | Origin |
|---|
| Mario | bitter, king-ruler | Male | Italian |
| Marley | From the lake in the meadow | Female | English |
| Marley | From the lake in the meadow | Female | English |
| Matilda | battle-mighty | Female | |
| Maximus | greatest | Male | Latin |
| Maxwell | Capable
| Male | Scottish |
| Maynard | Firm
| Male | |
| Mayo | yew-tree plain | Male | Irish |
| Megaton | | Male | |
| Mellow | | Unisex | Hebrew |
| Mercedes | Compassionate, merciful. | Female | Spanish |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Merlot | | Male | |
| Merry | Mirthful: joyous. Also an abbreviation of Meredith.
| Female | English |
| Mickey | Abbreviation of Michael and Micah Who is like God?
| Male | English |
| Midas | | Unisex | Hebrew |
| Midget | A small or miniature version | Unisex | |
| Mika | Abbreviation of Michaela:Micaela: Mikaela: Mikayla: Mychaela: Mikella. Feminine of Michael gift from God.
| Female | Japanese |
| Mikeal | | Male | |
| Milagritos | Miracle
| Female | |
| Milagrosa | Miracle
| Female | |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Min | quick | Female | Chinese |
| Mina | Precious Stone | Female | Hindi |