Family name Piamtachu (Piamtachu 
) , across the world, is a very rare cognomen. The last name Piamtachu is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Piamtachu | Thailand |
Krayut, Pongpun, and Phatcharee