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Last name סיאס (Saias , סיאס , Sieyes ) , all over the world, is a rare surname. The surname סיאס is habitual in Portugal, where it is quite a rare surname, Greece, where it is a rare surname, and Switzerland. Measured by absolute frequency, it is commonest in Portugal, France, and Italy. Very seldom, סיאס is the forename as well as the last name.