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In the world, Siin (Siin , Сиин , สิอิ้น) is a rare masculine first name. The given name Siin is habitual in Indonesia, where it is a rare masculine name, Morocco, where it is a very rare male name, and Russia, where it is an extremely rare masculine name. Not in comparison with a country's population, it is the most numerous in Indonesia, Morocco, and India. Also, Siin is the last name as well as the forename.