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Surname Sader (Sader , الصدر , سادر ) , across the world, is a common last name. The family name Sader is habitual in Western Asia, particularly Lebanon, where it is quite a common surname, Iraq, and Jordan, where it is quite a rare surname. In absolute terms, it is commonest in Iraq, Lebanon, and Brazil. Also, Sader is the forename as well as the last name.