| Name | Meaning | Gender | Origin |
|---|
| Moira | Uncertain, maybe bitter | Female | Hebrew |
| Mollie | Uncertain, maybe bitter | Female | Hebrew |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Mona | Little noble one | Female | Gaelic |
| Montana | Mountainous | Unisex | Latin |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Morgan | Uncertain, perhaps bright sea | Female | Welsh |
| Moriarty | Expert Seaman | Male | English |
| Munchkin | A very small elflike person. | Unisex | English |
| Muriel | Bright as the sea | Female | Gaelic |
| Murphy | Sea warrior | Male | Gaelic |
| Murray | Man of the sea | Male | Gaelic |
| Myles | Uncertain, perhaps peaceful | Male | Germanic |
| Napoleon | Sons of the mist, a race of dwarves | Male | Germanic |
| Neely | Feminine Of Neil Champion. | Unisex | English |
| Neil | Champion | Male | Gaelic |
| Nelson | Son of Neal | Male | English |
| Nevan | Sacred | Male | Gaelic |
| Nevin | Sacred | Male | Gaelic |
| Nikki | Victory of the people | Female | Greek |
| Ninja | | Unisex | Hebrew |
| Nipper | A small boy | Unisex | English |
| Nolan | Chariot-fighter, champion | Male | Gaelic |
| Oliver | Elf army | Male | French |
| Oran | Dark-haired | Male | Gaelic |
| Oriana | Dawn, gold | Female | Latin |
| Orla | Golden princess | Female | Gaelic |
| Orrin | Little green one | Male | Gaelic |
| Oscar | Divine spear | Male | English |
| Ossian | Little deer | Male | Gaelic |