Last name Saiyan (สายยันต์ 
, Saiyan 
, สายยัน ) , worldwide, is quite a rare family name. The cognomen Saiyan is habitual in Indonesia, where it is a rare surname, Bangladesh, and Thailand, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Indonesia, Bangladesh, and India. More frequently, Saiyan is the forename as well as the last name.