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Last name Tain (Tain , 太恩 , تاين ) , worldwide, is a common surname. The last name Tain is habitual in South-eastern Asia, particularly Myanmar, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Singapore, where it is a rare surname. Measured by absolute frequency, it is commonest in South-eastern Asia, particularly Myanmar, Indonesia, and Malaysia. Likewise, Tain is the forename as well as the last name.