Family name วิรัตน์กุล (วิรัตน์กุล 
, Wiratkul ) , across the world, is a very rare last name. The last name วิรัตน์กุล is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, วิรัตน์กุล is the forename as well as the last name.