Cognomen วงศ์เพชร (วงศ์เพชร 
, Wongphet 
, Wongpet ) , in the world, is a rare surname. The surname วงศ์เพชร is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, วงศ์เพชร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| วงศ์เพชร, Wongphem, Wongpet | Thailand |
| Wongphet | United States, Thailand |
Whongpetch, Wongpetch, Wongphetch, Wongphetr, and Wongtetch