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Family name Ajin (Ajin , 阿金 , อาจิน ) , in the entire world, is quite a common cognomen. The surname Ajin is characteristic of Guatemala, where it is quite a common surname, Malaysia, and Oman, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Malaysia, Guatemala, and China. Also, Ajin is the forename as well as the last name.