| Name | Meanings | Gender | Origin |
|---|---|---|---|
| Mac | Son Of .. | Boy | Celtic |
| Maureen | great | Girl | Celtic |
| Mavis | The Thrush | Girl | Celtic |
| Melva | Form of MELVIN. Mill Worker | Girl | Celtic |
| Melvin | Mill Worker | Boy | Celtic |
| Melvyn | Form of MELVIN. Mill Worker | Boy | Celtic |
| Merlin | By the Sea | Boy | Celtic |
| Moira | the great | Girl | Celtic |
| Morna | Affection, Beloved | Girl | Celtic |
| Moya | Great | Girl | Celtic |
| Murray | seaman | Boy | Celtic |
| Myrna | Beloved | Girl | Celtic |