| Name | Meaning | Gender | Origin |
|---|
| Manfred | Peaceful strength | Male | Germanic |
| Marmaduke | Devotee of Maedoc | Male | Gaelic |
| Mate | Gift From God | Unisex | English |
| Max | Little Maximus | Male | Latin |
| Maximillian | Little Maximus | Male | Latin |
| Medusa | Cunning | Unisex | English |
| Meeko | | Unisex | Hebrew |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Mittens | | Unisex | Hebrew |
| Mo | Moor | Unisex | Latin |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Moses | Drawn out of the water | Male | Hebrew |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | English |
| Murray | Man of the sea | Male | Gaelic |
| Mutley | | Unisex | Hebrew |
| Nana | Grace | Unisex | Hebrew |
| Nanook | Polar bear | Unisex | Native American |
| Napoleon | Sons of the mist, a race of dwarves | Male | Germanic |
| Neil | Champion | Male | Gaelic |
| Nelson | Son of Neal | Male | English |
| Nemo | No one | Male | Latin |
| Nipper | A small boy | Unisex | English |
| Norman | Thor mind, Thor courage | Male | Gaelic |
| Nugget | As in Chicken | Unisex | English |
| Odie | Woad hill | Unisex | English |
| Olaf | Ancestor | Male | Norse |
| Oliver | Elf army | Male | French |
| Orion | Son Of Fire | Male | Greek |
| Oscar | Divine spear | Male | English |
| Otis | One who hears well | Male | Greek |