Last name Piyadech (Piyadech 
) , across the world, is an extremely rare surname. The cognomen Piyadech is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Predominantly, Piyadech is the forename as well as the last name.
Malai, Nimkam, Srichai, Pienkan, Prommoon, Chaisombat, and Arkarapotiwong