| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 301 | Karney | Celtic | Fighter. | M | |
| 302 | Kayne | Celtic | Intelligent. | M | |
| 303 | Keaghan | Celtic | Son of Egan. | M | |
| 304 | Keane | Celtic | Tall and handsome. | M | |
| 305 | Kearney | Celtic | Fighter. | M | |
| 306 | Keary | Celtic | Dark. | M | |
| 307 | Keegan | Celtic | Son of Egan. | M | |
| 308 | Keene | Celtic | Tall and handsome. | M | |
| 309 | Kegan | Celtic | Son of Egan. | M | |
| 310 | Keir | Celtic | Dark skinned. | M | |
| 311 | Kelvan | Celtic | 'River man.'. | M | |
| 312 | Kelven | Celtic | River man. | M | |
| 313 | Kelvin | Celtic | From the narrow river. | M | |
| 314 | Kelvyn | Celtic | From the narrow river. | M | |
| 315 | Kelwin | Celtic | From the narrow river. | M | |
| 316 | Kelwyn | Celtic | From the narrow river. | M | |
| 317 | Kendal | Celtic | From the bright valley. | M | |
| 318 | Kendall | Celtic | From the bright valley. | M | |
| 319 | Kendhal | Celtic | From the bright valley. | M | |
| 320 | Kenneth | Celtic | Handsome. | M | |