Cognomen Ratthawan (Ratthawan 
) , across the world, is an extremely rare surname. The surname Ratthawan is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, Ratthawan is the forename as well as the last name.
Kamwan, Pudpong, Hengkrawit, Sermsuwannasuk, Thongnoi, Jatanapiwat, Sirisaengchan, and Chanyaphongkit