Family name ไข่หวาน (Kaiyawan 
, Tobtawee , Khaiwan 
) , worldwide, is a very rare surname. The family name ไข่หวาน is habitual in Thailand, where it is a very rare surname, and India, where it is an extremely rare surname. Very seldom, ไข่หวาน is the forename as well as the last name.