Last name นิรมลรัตน์ (นิรมลรัตน์ 
, Niramonrat ) , in the entire world, is a rare family name. The family name นิรมลรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, นิรมลรัตน์ is the forename as well as the last name.