| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Maeleachlainn | - | Ancient Irish | ||
| Maeve | MAYV | Irish, Irish Mythology | ||
| Mahon | - | Irish | ||
| MainchÍN | - | Irish | ||
| MairÉAd | - | Irish | ||
| Mairenn | - | Irish | ||
| MaitiÚ | MAT-yoo | Irish | ||
| Malachy | - | Irish | ||
| Mallaidh | - | Irish | ||
| Mannix | - | Irish | ||
| Manus | - | Irish | ||
| Maolsheachlann | - | Irish | ||
| Marcas | - | Irish, Scottish | ||
| MathÚIn | - | Irish | ||
| Mathghamhain | - | Ancient Irish |