| Name | Meaning | Gender | Origin |
|---|
| Merritt | Boundary gate | Unisex | English |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Mo | Moor | Unisex | Latin |
| Montana | Mountainous | Unisex | Latin |
| 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 |
| Mozart | | Unisex | Hebrew |
| Munchkin | A very small elflike person. | Unisex | English |
| Murphy | Sea warrior | Male | Gaelic |
| Neo | New | Male | English |
| Nero | Stern | Male | Latin |
| Nico | Victory of the people | Male | Greek |
| Nigel | Champion From The Irish And Scottish Niall. | Male | Gaelic |
| Ninja | | Unisex | Hebrew |
| Nipper | A small boy | Unisex | English |
| Nugget | As in Chicken | Unisex | English |
| Nyx | Night | Female | Greek |
| Odie | Woad hill | Unisex | English |
| Oliver | Elf army | Male | French |
| Ollie | Elf army | Male | French |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Orion | Son Of Fire | Male | Greek |
| Oscar | Divine spear | Male | English |
| Otis | One who hears well | Male | Greek |
| Otto | Wealth | Male | German |
| Owen | Well born, yew born | Male | Gaelic |
| Pablo | Small | Male | Latin |
| Paco | From France | Male | Latin |