Last name ขวัญเพชร (ขวัญเพชร 
, Kwanphet , Kwanpet ) , around the globe, is a rare cognomen. The surname ขวัญเพชร is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname. Very seldom, ขวัญเพชร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kwanphet, Kwanpet, ขวัญเพชร, Khwanphet | Thailand |
Khawanphet, Khawnpet, Khwanpet, Khwanpetch, Khwanphetchara, Khwanphetr, Kwanpetch, Kwhanphet, Kwhunpetch, Kwuanphet, Kwunpech, and Kwunphet