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Last name Toin (Toin , โตอิน , ต่ออิ่น) , in the world, is quite a rare cognomen. The surname Toin is characteristic of Thailand, where it is quite a rare surname, Japan, where it is a rare surname, and Singapore. Measured by absolute frequency, it is commonest in Thailand, Japan, and Indonesia. Very seldom, Toin is the forename as well as the last name.