Surname Wiriyawat (วิริยวัฒน์ 
, Wiriyawat , วิริยาวัฒน์ ) , in the world, is a rare last name. The last name Wiriyawat is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, Wiriyawat is the forename as well as the last name.