| 626 | KEAST + var. (John) | St. Buryan | c1725 | |||||
| 205 | KEEP | Northill, Bedfordshire | 1550+ | |||||
| 211 | KELLOW | Camelford | 1850-1950 | |||||
| 605 | KEMP | Gerrans | All | |||||
| 303 | KENIVER | South Petherwin | 1700-1800 | |||||
| 303 | KENT | St. Columb Major | 1700-1800 | |||||
| 205 | KEOGHAN | Monaghan, Ireland | All | |||||
| 205 | KEOGHAN | Berryedge, Durham | All | |||||
| 510 | KERSLAKE | St Giles in the Heath | 1750+ | |||||
| 600 | KEVERN | St. Keverne | 1600-2002 | |||||
| 205 | KING | Flitton | 1600+ | |||||
| 205 | KING | Long Melford | c1775 | |||||
| 744 | KITTO + var. | Breage | 1800 - 1875 | |||||
| 731 | KNEEBONE | Gwennap / Redruth | 1750+ | |||||
| 028 | KNIGHT | St. Austell | 1750+ | |||||
| 205 | KNIGHT | Lidlington, Bedfordshire | c1780 | |||||
| 524 | KNIGHT | Roche/St. Dennis | 1700-1899 | |||||
| 205 | KNOWLER | Margate, Kent | c1500 | |||||