| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 541 | Morvyn | Gaelic | Pale. | M | |
| 542 | Muireach | Gaelic | Moorish. | M | |
| 543 | Mungan | Gaelic | Gaelic form of Mungo. | M | |
| 544 | Mungo | Gaelic | Amiable; beloved. | M | |
| 545 | Murchadh | Gaelic | Protector of the sea. | M | |
| 546 | Murdoch | Gaelic | Mariner. | M | |
| 547 | Murthuile | Gaelic | Sea tide. | M | |
| 548 | Neacal | Gaelic | People's victory. | M | |
| 549 | Neall | Gaelic | Champion. | M | |
| 550 | Neil | Gaelic | Champion. | M | |
| 551 | Nels | Gaelic | Son of Neil. | M | |
| 552 | Nelson | Gaelic | Son of Neil. | M | |
| 553 | Nevin | Gaelic | Worships the saints. | M | |
| 554 | Nevins | Gaelic | Worships the saints. | M | |
| 555 | Nevyn | Gaelic | Worships the saints. | M | |
| 556 | Niall | Gaelic | Champion. | M | |
| 557 | Nigel | Gaelic | Champion From the Irish and Scottish Niall. | M | |
| 558 | Nijel | Gaelic | Champion From the Irish and Scottish Niall. | M | |
| 559 | Nolan | Gaelic | Famous. | M | |
| 560 | Noland | Gaelic | Famous. | M | |