Last name วิโรจน์รัตน์ (วิโรจน์รัตน์ 
, Wirojrat , Virojrat ) , in all the world, is a rare family name. The surname วิโรจน์รัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Likewise, วิโรจน์รัตน์ is the forename as well as the last name.