| Name | Meaning | Gender | Origin |
|---|
| Medusa | Guardian | Unisex | Latin |
| Meg | Pearl | Female | English |
| Mia | Mine | Female | Scandinavian |
| Mica | Humble | Unisex | Hebrew |
| Minerva | after the Roman goddess of the hunt | Female | Latin |
| Missy | Informal term for young woman | Female | English |
| Mocha | Coffee of high quality. | Female | Arabic |
| Mogget | after the character in the fantasy novels by Garth Nix | Unisex | |
| Mogwai | | Unisex | Hebrew |
| Mona | Gathered of the seed of a jimson weed
| Female | Irish |
| Monique | advisor | Female | |
| Motley | | Unisex | |
| Moxie | Ability to face difficulty with courage. | Female | English |
| Mud | | Unisex | Hebrew |
| Muesli | Breakfast mixture of oats, nuts and dried fruit. | Unisex | |
| Myla | Merciful | Unisex | English |
| Mystique | Air of mystery.
| Female | |
| Nebula | misty | Female | Latin |
| Nightengale | | Unisex | |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Paprika | Spicy powder made from sweet red peppers. | Unisex | |
| Parsnip | | Unisex | |
| Patches | | Male | |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |