| Name | Meaning | Gender | Origin |
|---|
| Max | Little Maximus | Male | Latin |
| Maxie | Pet form of names starting with Max | Unisex | English |
| Meg | Pearl | Female | Greek |
| Merlin | Sea fort | Male | Welsh |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Miles | Uncertain, perhaps peaceful | Male | Germanic |
| Minnie | Will, desire + helmet, protection | Female | Germanic |
| Missy | Bee | Female | Greek |
| Misty | Misty | Female | English |
| Moca | | Unisex | Hebrew |
| Mocha | Coffee of high quality. | Unisex | English |
| Moe | Moor | Male | Latin |
| Mollie | Uncertain, maybe bitter | Female | Hebrew |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Monty | Gomeric's hill | Male | French |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Muffin | A small cup shaped cake | Unisex | English |
| Murphy | Sea warrior | Male | Gaelic |
| Mystic | | Unisex | Hebrew |
| Nala | Loved | Female | African |
| Nina | Strong | Female | Latin |
| Ninja | | Unisex | Hebrew |
| Oliver | Elf army | Male | French |
| Olivia | Elf army | Female | English |
| Olly | Elf army | Unisex | English |
| Onyx | A gemstone with bands of different colours. | Unisex | English |
| Opal | Jewel, gem | Female | Sanskrit |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Orla | Golden princess | Female | Gaelic |
| Oscar | Divine spear | Male | English |