| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 501 | Kevan | Celtic | Gentle. | M | |
| 502 | Kevin | Celtic | Gentle. | M | |
| 503 | Kevyn | Celtic | Gentle. | M | |
| 504 | Kieran | Celtic | Dark skinned. | M | |
| 505 | Kilian | Celtic | Blind. | M | |
| 506 | Killian | Celtic | Blind. | M | |
| 507 | Kirwin | Celtic | Dark skinned. | M | |
| 508 | Kirwyn | Celtic | Dark skinned. | M | |
| 509 | Kunsgnos | Celtic | Wise. | M | |
| 510 | Kynthelig | Celtic | Guide. | M | |
| 511 | Lairgnen | Celtic | Of Connaught. | M | |
| 512 | Lavena | Celtic | Joy. | F | |
| 513 | Lee | Celtic | Healer. | M | |
| 514 | Leigh | Celtic | Healer. | M | |
| 515 | Leith | Celtic | Meadow. | M | |
| 516 | Lesley | Celtic | From the gray fortress. | F | |
| 517 | Lesley | Celtic | From the gray fortress. | M | |
| 518 | Leslie | Celtic | From the gray fortress. | F | |
| 519 | Leslie | Celtic | From the gray fortress. | M | |
| 520 | Lincoln | Celtic | From the settlement by the pool. | M | |