| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1401 | Mitchell | Irish | Form of Michael 'Who is like God?'. | M | |
| 1402 | Mogue | Irish | Name of a saint. | M | |
| 1403 | Moina | Irish | Noble. | F | |
| 1404 | Moira | Irish | Bitter. | F | |
| 1405 | Moire | Irish | Bitter. | F | |
| 1406 | Molan | Irish | Servant of the storm. | M | |
| 1407 | Molli | Irish | From the Gaelic Maili which is a pet form of Mary: bitter. | F | |
| 1408 | Molli | Irish | From the Gaelic Maili which is a pet form of Mary 'bitter.'. | M | |
| 1409 | Mollie | Irish | From the Gaelic Maili which is a pet form of Mary: bitter. | F | |
| 1410 | Molloy | Irish | Noble chief. | M | |
| 1411 | Mona | Irish | Noble. | F | |
| 1412 | Monca | Irish | Wise. | F | |
| 1413 | Moncha | Irish | Alone. | F | |
| 1414 | Monohan | Irish | Monk. | M | |
| 1415 | Mooney | Irish | Wealthy. | M | |
| 1416 | Moore | Irish | Surname. | M | |
| 1417 | Mor | Irish | Great. | F | |
| 1418 | Morain | Irish | Great. | M | |
| 1419 | Moran | Irish | Great. | M | |
| 1420 | More | Irish | Great. | F | |