| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 401 | Iomar | Gaelic | Archer. | M | |
| 402 | Irving | Gaelic | Handsome. | M | |
| 403 | Kade | Gaelic | From the wetlands. | M | |
| 404 | Kael | Gaelic | Slender; fair. Form of Caelan. | M | |
| 405 | Kaelan | Gaelic | Slender; fair. Form of Caelan. | M | |
| 406 | Kaelin | Gaelic | Slender; fair. Form of Caelan. | M | |
| 407 | Kaine | Gaelic | Tribute. | M | |
| 408 | Kalan | Gaelic | Slender; fair. Form of Caelan. | M | |
| 409 | Kalen | Gaelic | Slender; fair. Form of Caelan. | M | |
| 410 | Kaley | Gaelic | Slender; fair. Form of Caelan. | M | |
| 411 | Kalin | Gaelic | Slender; fair. Form of Caelan. | M | |
| 412 | Kane | Gaelic | Tribute. | M | |
| 413 | Kayne | Gaelic | Tribute. | M | |
| 414 | Kearn | Gaelic | Little dark. | M | |
| 415 | Keefe | Gaelic | Cherished. | M | |
| 416 | Keegan | Gaelic | Small and fiery. | M | |
| 417 | Keelan | Gaelic | Slender; fair. | M | |
| 418 | Kegan | Gaelic | Small and fiery. | M | |
| 419 | Keifer | Gaelic | Cherished. | M | |
| 420 | Keilan | Gaelic | Slender; fair. | M | |