| Maura | Woman | Irish Names |
| Maureen | Woman | Irish Names |
| Mave | Woman | Irish Names |
| McGee | Unisex | Irish Names |
| McKinley | Unisex | Irish Names |
| Meabh | Woman | Irish Names |
| Meara | Woman | Irish Names |
| Melva | Woman | Irish Names |
| Miach | Unisex | Irish Names |
| Micheal | Man | Irish Names |
| Monahan | Unisex | Irish Names |
| Moran | Unisex | Irish Names |
| Morey | Unisex | Irish Names |
| Morna | Woman | Irish Names |
| Morrigan | Unisex | Irish Names |
| Muireann | Unisex | Irish Names |
| Muirne | Woman | Irish Names |
| Muriel | Woman | Irish Names |
| Murphy | Unisex | Irish Names |
| Murron | Woman | Irish Names |