Last name แดงเพชร (Roungpet 
, แดงเพชร , Damgphet ) , in all the world, is a rare cognomen. The surname แดงเพชร is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, แดงเพชร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Roungpet | United States, Thailand |
| แดงเพชร, Damgphet, Dangpetch | Thailand |
Daengpetch, Daengphet, Daengprethet, Daungpech, Daungphet, Taedaengpech, and Taedangphet