| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1321 | MacMurra | Irish | Son of Murray. | M | |
| 1322 | MacQuaid | Irish | Son of Quaid. | M | |
| 1323 | Mada | Irish | From Mathilda. | F | |
| 1324 | Madailein | Irish | Irish form of Madeleine: magnificent. | F | |
| 1325 | Madden | Irish | Smalldog Milos. | M | |
| 1326 | Mad\uley | Irish | Son of Olaf. | M | |
| 1327 | Maeleachlainn | Irish | Servant. | M | |
| 1328 | Maelisa | Irish | Serves Christ. | M | |
| 1329 | Maeve | Irish | Joy. The name of an early queen of Connaught. | F | |
| 1330 | Magee | Irish | Surname. | M | |
| 1331 | Mago | Irish | Great. | M | |
| 1332 | Maher | Irish | Generous. | M | |
| 1333 | Mahon | Irish | Bear. | M | |
| 1334 | Mahoney | Irish | Surname. | M | |
| 1335 | Maible | Irish | Lovable. | F | |
| 1336 | Maighdlin | Irish | Irish form of Madeleine: magnificent. | F | |
| 1337 | Maille | Irish | Pearl. | F | |
| 1338 | Mailsi | Irish | Pearl. | F | |
| 1339 | Mainchin | Irish | Monk. | M | |
| 1340 | Maire | Irish | Bitter. | F | |