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Family name Shdad (شداد , Shdad ) , in the entire world, is a common cognomen. The cognomen Shdad is habitual in Yemen, where it is quite a common surname, Syria, where it is quite a rare surname, and Egypt. Not in comparison with a country's population, it is the most numerous in Egypt, Yemen, and Sudan. Very seldom, Shdad is the forename as well as the last name.