| Name | Meaning | Gender | Origin |
|---|
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mikey | Who is like God? | Unisex | Hebrew |
| Miles | Uncertain, perhaps peaceful | Male | Germanic |
| Milla | Industrious | Female | English |
| Millie | Labour | Female | Germanic |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Missy | Bee | Female | Greek |
| Misty | Misty | Female | English |
| Mocha | Coffee of high quality. | Unisex | English |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Moondust | | Unisex | Hebrew |
| Moxie | Ability to face difficulty with courage. | Unisex | English |
| Mozart | | Unisex | Hebrew |
| Muffin | A small cup shaped cake | Unisex | English |
| Muffy | | Unisex | Hebrew |
| Murphy | Sea warrior | Male | Gaelic |
| Mystic | | Unisex | Hebrew |
| Natasha | (Christ's) birthday | Female | Latin |
| Newton | New settlement, new enclosure | Male | English |
| Nibbler | | Unisex | Hebrew |
| Nicky | Victory of the people | Unisex | Greek |
| Niko | Victory of the people | Male | Greek |
| Nova | New | Female | Latin |
| Nyla | Cloud or champion | Female | Gaelic |
| Oliver | Elf army | Male | French |
| Olivia | Elf army | Female | English |
| Ollie | Elf army | Male | French |
| Omega | Great | Female | English |
| Onyx | A gemstone with bands of different colours. | Unisex | English |