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Family name Rajin (Rajin , راجين , Ражин ) , throughout the world, is quite a rare cognomen. The last name Rajin is characteristic of Serbia, where it is quite a rare surname, Bangladesh, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it is the most numerous in Bangladesh, Indonesia, and Serbia. More prevalently, Rajin is the forename as well as the last name.