| Name | Meaning | Gender | Origin |
|---|
| Meaghan | Pearl | Unisex | English |
| Meg | Pearl | Female | English |
| Megan | mighty, strong able, pearl | Female | English |
| Meggie | Pearl | Unisex | English |
| Meghann | Pearl | Unisex | Greek |
| Melanie | Dark.
| Female | Greek |
| Meta | Ambitious | Unisex | Latin |
| Mica | Humble | Unisex | Hebrew |
| Midge | Gnat like flies found near swamps. A little person | Female | English |
| Millie | English, gentle strength | Female | English |
| Minnie | Form of Williamina
| Female | English |
| Molly | Bitter
| Female | English |
| Mona | Gathered of the seed of a jimson weed
| Female | Irish |
| Moonstone | | Unisex | |
| Nickel | | Unisex | Hebrew |
| Noire | | Unisex | |
| Obsidian | | Unisex | |
| Olive | kind one; olive tree, peace. Symbol of peace. A small oval fruit. | Female | English |
| 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 |
| Opaline | Precious Jewel | Unisex | English |
| Padme | | Unisex | Hebrew |
| Patty | patrician | Female | English |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Peg | pearl | Female | English |