| Name | Meaning | Gender | Origin |
|---|
| Marlowe | after Philip | Male | English |
| Marmaduke | leader of the seas | Male | Irish |
| Marnie | rejoice | Female | English |
| Marsh | From The Marsh | Male | English |
| Marvin | beautiful sea; good friend | Male | Welsh |
| Masha | Beloved | Unisex | Russian |
| Masika | Swahili for born in the rain | Unisex | |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Maxwell | Capable
| Male | Scottish |
| May | bitter | Female | English |
| Maya | Abbreviation of Amalia: variant of Maia.
| Female | Hebrew |
| Melba | slender, soft; mallow flower | Female | Modern |
| Melbourne | From the mill stream
| Male | |
| Meredith | great ruler | Female | Welsh |
| Merideth | Sea Lord | Unisex | English |
| Merissa | Of The Sea | Unisex | Latin |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Merlyn | Sea Fortress | Unisex | English |
| Merrick | ruler of the sea | Male | Anglo-Welsh |
| Merry | Mirthful: joyous. Also an abbreviation of Meredith.
| Female | English |
| Mervyn | Famous Friend | Male | English |
| Meryl | Bright Sea | Female | English |
| Mesi | Water | Unisex | Egyptian |
| Mia | Mine | Female | Scandinavian |