| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 421 | Keillan | Gaelic | Slender; fair. | M | |
| 422 | Keir | Gaelic | Dusky; dark-haired. Actor Keir Dullea. | M | |
| 423 | Keiran | Gaelic | Dusky; dark-haired. | M | |
| 424 | Kelby | Gaelic | Place by the fountain or spring. | M | |
| 425 | Kelden | Gaelic | Slender; fair. | M | |
| 426 | Kellan | Gaelic | Slender; fair. | M | |
| 427 | Kelle | Gaelic | Slender; fair. | M | |
| 428 | Kellen | Gaelic | Slender; fair. Form of Caelan. | M | |
| 429 | Keller | Gaelic | Little champion. | M | |
| 430 | Kelley | Gaelic | Warrior. | M | |
| 431 | Kelli | Gaelic | Lively; aggressive. | M | |
| 432 | Kelly | Gaelic | Warrior. | M | |
| 433 | Kellye | Gaelic | Lively; aggressive. | M | |
| 434 | Kelvin | Gaelic | From the narrow river. | M | |
| 435 | Keme | Gaelic | Little dark. | M | |
| 436 | Kendon | Gaelic | Brave chieftain. | M | |
| 437 | Kendrick | Gaelic | Son of Harry. | M | |
| 438 | Kennard | Gaelic | Brave chieftain. | M | |
| 439 | Kennedy | Gaelic | Helmeted. | M | |
| 440 | Kenner | Gaelic | Brave chieftain. | M | |