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