Cognomen Piyapach (Piyapach 
, ปิยะพัชร ) , globally, is an extremely rare family name. The family name Piyapach is habitual in South-eastern Asia, particularly Malaysia, where it is a very rare surname. Much more prevalently, Piyapach is the forename as well as the last name.
Pruktholkul, Sirichokworakij, Klungthamniam, Songprasirt, Thongprew, Jamjarasrattana, Deeduangpan, Paibulsiri, Burathaworn, Sriwongvisal, Wannarat, Jinnakoon, Limpakdee, Rujirachun, Punwaree, Panwaree, Suttakun, Nontree, Thavornthong, and Watcharathavornsak