Cognomen วิรุณพันธุ์ (วิรุณพันธุ์ 
) , all around the world, is a very rare last name. The surname วิรุณพันธุ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, วิรุณพันธุ์ is the forename as well as the last name.