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Family name Fajin (发进 , 法金 , 发锦 ) , around the world, is a rare last name. The cognomen Fajin is habitual in Spain, where it is a rare surname, Argentina, where it is a very rare surname, and Portugal. Measured by absolute frequency, it is commonest in China, Spain, and Argentina. More frequently, Fajin is the forename as well as the last name.