| Name | Meaning | Gender | Origin |
|---|
| Moonlight | | Unisex | Hebrew |
| Morgan | Uncertain, perhaps bright sea | Female | Welsh |
| Moriarty | Expert Seaman | Male | English |
| Moss | Drawn out of the water | Male | Hebrew |
| Mozart | | Unisex | Hebrew |
| Muffin | A small cup shaped cake | Unisex | English |
| Muffy | | Unisex | Hebrew |
| 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 |
| Myra | Uncertain, perhaps myrrh, unguent | Female | Latin |
| Nancy | Grace | Female | Hebrew |
| 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 |
| Niamh | Radiance | Unisex | Gaelic |
| Nick | Victory of the people | Male | Greek |
| Nicki | Victory of the people | Female | Greek |
| Nicky | Victory of the people | Unisex | Greek |
| Nike | Victory | Female | Greek |
| Nikki | Victory of the people | Female | Greek |
| Nina | Strong | Female | Latin |
| Nolan | Chariot-fighter, champion | Male | Gaelic |
| Nora | Light | Female | English |
| Olive | Olive | Female | English |
| Oran | Dark-haired | Male | Gaelic |
| Oriana | Dawn, gold | Female | Latin |