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In all the world, Sinjin (Sinjin ) is a very rare unisex given name. The forename Sinjin is habitual in South Africa, where it is a very rare largely masculine, but seldom feminine name, the United States, where it is a very rare epicene name, and India, where it is an extremely rare female name. Much less frequently, Sinjin is the last name as well as the forename.