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Family name Silvius (Silvius , Sylwiusz , Силвио ) , around the globe, is quite a rare surname. The cognomen Silvius is habitual in Netherlands, where it is quite a rare surname, Poland, and Israel, where it is a rare surname. In absolute terms, it is commonest in Poland, the United States, and Netherlands. Very seldom, Silvius is the forename as well as the last name.