| Name | Meaning | Gender | Origin |
|---|
| Mave | Joy | Female | English |
| Maximus | The greatest | Male | Latin |
| Mckenna | Son of Cionaodh | Unisex | Gaelic |
| Mckenzie | Son of Coinneach | Female | Gaelic |
| Meara | Happy | Male | English |
| Melchior | King city | Male | Persian |
| Melva | Handmaiden | Female | English |
| Melvin | Uncertain, possibly bad town | Male | English |
| Melvina | Smooth brow | Female | Gaelic |
| Melvyn | Uncertain, possibly bad town | Male | English |
| Meriel | Bright as the sea | Female | Gaelic |
| Merrill | Bright as the sea | Male | Gaelic |
| Meryl | Bright as the sea | Unisex | Gaelic |
| Miach | Myth Name | Male | Irish |
| Miles | Uncertain, perhaps peaceful | Male | Germanic |
| Minerva | Mind | Female | Latin |
| Moira | Uncertain, maybe bitter | Female | Hebrew |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Mona | Little noble one | Female | Gaelic |
| Monroe | Mouth of the River Roe | Male | Gaelic |
| More | Dark Skinned | Unisex | English |
| Morgan | Uncertain, perhaps bright sea | Female | Welsh |
| Moriarty | Expert Seaman | Male | English |
| Morna | Beloved | Female | Gaelic |
| Moya | Exceptional | Female | English |
| Murdock | Sea | Male | Gaelic |
| 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 |