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Surname Siyah (Siyah , سیاه ) , in the world, is quite a rare cognomen. The cognomen Siyah is habitual in Maldives, where it is quite a common surname, Afghanistan, where it is quite a rare surname, and Morocco, where it is a rare surname. Not in comparison with a country's population, it is commonest in Indonesia, Afghanistan, and Morocco. Very seldom, Siyah is the forename as well as the last name.