| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 581 | Ken | Welsh | Clear water. | M | |
| 582 | Kendric | Welsh | Royal chieftain. Jehovah has remembered. Surname. | M | |
| 583 | Kendrick | Welsh | Royal chieftain. Surname. | M | |
| 584 | Kendrik | Welsh | Royal chieftain. Surname. | M | |
| 585 | Kendrix | Welsh | Royal chieftain. Surname. | M | |
| 586 | Kenn | Welsh | Clear water. | M | |
| 587 | Kenrick | Welsh | Royal chieftain. Surname. | M | |
| 588 | Kenrik | Welsh | Royal chieftain. Surname. | M | |
| 589 | Kent | Welsh | White. | M | |
| 590 | Kenyon | Welsh | From Ennion's mound. | M | |
| 591 | Kevyn | Welsh | From the ridge. | M | |
| 592 | Kian | Welsh | Legendary father of Lugh. | M | |
| 593 | Kigva | Welsh | Legendary wife of partholon's son. | F | |
| 594 | Kilydd | Welsh | Legendary son of Kelyddon. | M | |
| 595 | Kim | Welsh | Diminutive of Kimball: Chief of war. Leader. | M | |
| 596 | Kimball | Welsh | Warrior chief. | M | |
| 597 | Kimble | Welsh | Warrior chief. | M | |
| 598 | Kraig | Welsh | Variant of Craig: Rock. | M | |
| 599 | Kyledyr | Welsh | Legendary son of Nwython. | M | |
| 600 | Kynan | Welsh | Chief. | M | |