| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 521 | Moyna | Irish | Variant of Mona: Noble. | F | |
| 522 | Muadhnait | Irish | Noble one. | F | |
| 523 | Muiel | Irish | Knows the sea. | F | |
| 524 | Muire | Irish | Bitter. | F | |
| 525 | Muireann | Irish | Long haired. | F | |
| 526 | Muirgheal | Irish | Knows the sea. | F | |
| 527 | Muirne | Irish | Beloved. | F | |
| 528 | Murel | Irish | Knows the sea. | F | |
| 529 | Myma | Irish | Beloved. | F | |
| 530 | Nainsi | Irish | Irish form of Nancy: graceful. | F | |
| 531 | Neala | Irish | Champion. | F | |
| 532 | Nelda | Irish | Champion. | F | |
| 533 | Nola | Irish | Famous; noble - feminine form of Nolan. Also can be a diminutive of Finola: Fair shoulders. | F | |
| 534 | Nora | Irish | Diminutive of Honor. | F | |
| 535 | Norah | Irish | Variant of Nora: Diminutive of Honor. | F | |
| 536 | Noreen | Irish | Variant of Nora: light; honor. | F | |
| 537 | Noreena | Irish | Variant of Nora: light; honor. | F | |
| 538 | Nuala | Irish | Lovely shoulders. | F | |
| 539 | Obharnait | Irish | The color of olive. | F | |
| 540 | Ohnicio | Irish | Honor. | F | |