Surname Riwin (ไรวินทร์ 
, Riwin 
, ไรวิน ) , in all the world, is a rare family name. The cognomen Riwin is characteristic of South-eastern Asia, particularly Singapore, where it is a rare surname, Indonesia, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, Singapore, and India. More frequently, Riwin is the forename as well as the last name.