| Name | Meaning | Gender | Origin |
|---|
| Mirabel | Lovely | Female | Latin |
| Missy | Bee | Female | Greek |
| Misty | Misty | Female | English |
| Mitzy | | Unisex | Hebrew |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Monty | Gomeric's hill | Male | French |
| Morgan | Uncertain, perhaps bright sea | Female | Welsh |
| Morgana | Uncertain, perhaps bright sea | Female | Welsh |
| Murphy | Sea warrior | Male | Gaelic |
| Nefertiti | The beautiful woman has come | Unisex | Ancient Egyptian |
| Nelson | Son of Neal | Male | English |
| Nero | Stern | Male | Latin |
| Nigel | Champion From The Irish And Scottish Niall. | Male | Gaelic |
| Nike | Victory | Female | Greek |
| Niki | Victory of the people | Female | Greek |
| Niles | People's Victory | Male | Gaelic |
| Nimbus | Rain Cloud | Male | English |
| Ninja | | Unisex | Hebrew |
| Nola | Fair shoulder, white shoulder | Female | Gaelic |
| Nugget | As in Chicken | Unisex | English |
| Nutmeg | | Unisex | Hebrew |
| Oberon | Noble bear | Unisex | German |
| Obsidian | | Unisex | Hebrew |
| Oden | | Unisex | Hebrew |
| Odette | Wealth | Female | Germanic |
| Ollie | Elf army | Male | French |
| Omega | Great | Female | English |
| Onyx | A gemstone with bands of different colours. | Unisex | English |
| Opal | Jewel, gem | Female | Sanskrit |
| Ophelia | Help | Female | Greek |