| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 661 | Waljan | Welsh | Chosen. | M | |
| 662 | Winn | Welsh | Handsome. | M | |
| 663 | Wmffre | Welsh | Welsh form of Humphrey 'friend of the Huns'. | M | |
| 664 | Wren | Welsh | Ruler. | M | |
| 665 | Wyn | Welsh | Handsome. | M | |
| 666 | Wynn | Welsh | White; fair; handsome. | M | |
| 667 | Yale | Welsh | Heights; upland. | M | |
| 668 | Yorath | Welsh | Worthy lord. | M | |
| 669 | Ysberin | Welsh | Legendary son of Fflergant. | M | |
| 670 | Ysgawyn | Welsh | Legendary son of Panon. | M | |