| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 501 | Melva | Irish | Ruler. | F | |
| 502 | Merna | Irish | Beloved. | F | |
| 503 | Mide | Irish | Thirsty. | F | |
| 504 | Min | Irish | Smooth; fine; small. | F | |
| 505 | Moina | Irish | Noble. | F | |
| 506 | Moira | Irish | Bitter. | F | |
| 507 | Moire | Irish | Bitter. | F | |
| 508 | Molli | Irish | From the Gaelic Maili which is a pet form of Mary: bitter. | F | |
| 509 | Mollie | Irish | From the Gaelic Maili which is a pet form of Mary: bitter. | F | |
| 510 | Mona | Irish | Noble. | F | |
| 511 | Monca | Irish | Wise. | F | |
| 512 | Moncha | Irish | Alone. | F | |
| 513 | Mor | Irish | Great. | F | |
| 514 | More | Irish | Great. | F | |
| 515 | Moreen | Irish | Great. | F | |
| 516 | Morella | Irish | Great. | F | |
| 517 | Morgayne | Irish | Medieval form of Welsh Morcan, meaning bright sea. | F | |
| 518 | Morna | Irish | Beloved. | F | |
| 519 | Morrin | Irish | Long haired. | F | |
| 520 | Moya | Irish | Bitter. | F | |