Last name แพงเพชร (Paungpet 
, แพงเพชร , Paungpetch 
) , globally, is a rare cognomen. The last name แพงเพชร is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, แพงเพชร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| แพงเพชร, Paungpet, Paengphet | Thailand |
| Paungpetch | United States, Thailand |
Diamond, Paengpetch, Paungpeth, and Phaengphet