| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 721 | Morvran | Welsh | Legendary son of Tegid. | M | |
| 722 | Morvudd | Welsh | Legendary daughter of Uryen. | F | |
| 723 | Morwenna | Welsh | Maiden; sea wave. | F | |
| 724 | Myfanawy | Welsh | My fine, rare one. | F | |
| 725 | Myfanwy | Welsh | My fine, rare one. | F | |
| 726 | Myrddin | Welsh | Welsh form of Merlin: Hawk. From the sea fortress. | M | |
| 727 | Myrick | Welsh | Dark-skinned; A Moor. Form of Maurice. | M | |
| 728 | Naw | Welsh | Legendary son of Seithved. | M | |
| 729 | Neb | Welsh | Legendary son of Caw. | M | |
| 730 | Neifion | Welsh | Welsh form of Neptune 'god of the seas'. | M | |
| 731 | Nerth | Welsh | Legendary son of Cadam. | M | |
| 732 | Nerthach | Welsh | Legendary son of Gwawrddur. | M | |
| 733 | Nerys | Welsh | Lord. | F | |
| 734 | Neued | Welsh | Legendary daughter of KyvwIch. | F | |
| 735 | Neued | Welsh | Legendary father of Tringad. | M | |
| 736 | NewIyn | Welsh | Dwells near the new pool. | M | |
| 737 | Newlin | Welsh | Dwells near the new pool. | M | |
| 738 | NewyddIlyn | Welsh | Dwells near the new pool. | M | |
| 739 | Ninian | Welsh | St. Ninian was a 5th century bishop sent to Scotland to convert the Picts to Christianity. | M | |
| 740 | Nissyen | Welsh | Legendary son of Eurosswydd. | M | |