Surname แก่นเพชร (Kaenphet 
, Kaenpet , Kaenpetch ) , around the globe, is a rare last name. The cognomen แก่นเพชร is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, แก่นเพชร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kaenphet, Kaenpetch, Kaenpet | Thailand |
Gaenpech, Gaenpetch, and Kaenphetch
| พอเจตน์ แก่นเพชร Thai actor, TH (b. 1948) |
|