| Name | Meaning | Gender | Origin |
|---|
| Marshall | Horse servant | Male | Germanic |
| Martin | From the god Mars | Male | Latin |
| Marvin | Uncertain, possibly eminent marrow | Male | Welsh |
| Matilda | Powerful battler | Female | Germanic |
| Maude | Powerful battler | Female | German |
| Maximilian | Little Maximus | Male | Latin |
| Maxwell | Maccus's stream | Male | English |
| Maynard | Mighty and brave | Male | Germanic |
| Medea | Cunning | Female | Greek |
| Melinda | Blending of 'mel' and 'inda' | Female | English |
| Melville | Bad town | Male | French |
| Melvin | Uncertain, possibly bad town | Male | English |
| Merlin | Sea fort | Male | Welsh |
| Mervin | Uncertain, possibly eminent marrow | Male | Welsh |
| Mervyn | Uncertain, possibly eminent marrow | Male | Welsh |
| Mika | Beautiful smell | Female | Japanese |
| Mildred | Gentle strength | Female | English |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Milton | Settlement by the mill | Male | English |
| Minnie | Will, desire + helmet, protection | Female | Germanic |
| Missy | Bee | Female | Greek |
| Montgomery | Gomeric's hill | Male | French |
| Moony | | Unisex | Hebrew |
| Morgana | Uncertain, perhaps bright sea | Female | Welsh |
| Morris | Moor | Male | Latin |
| Mortimer | Dead sea | Male | French |
| Murray | Man of the sea | Male | Gaelic |
| Myrtle | Myrtle | Female | English |
| Nana | Grace | Unisex | Hebrew |
| Napoleon | Sons of the mist, a race of dwarves | Male | Germanic |