Family name Rangkakulnuwat (Rangkakulnuwat 
) , in the world, is a very rare surname. The last name Rangkakulnuwat is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
Khem, Tanat, Somrak, Sukanya, Vilawan, Parichart, Pisuttikan, and Pitchayaporn