Surname ประยูรยงค์ (ประยูรยงค์ 
, Prayunyounyong ) , in the entire world, is a very rare last name. The surname ประยูรยงค์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ประยูรยงค์ is the forename as well as the last name.