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Family name Sylwiusz (Silvius , Sylwiusz ) , globally, is quite a rare last name. The surname Sylwiusz is characteristic of Netherlands, where it is quite a rare surname, Poland, and Israel, where it is a rare surname. Not in comparison with a country's population, it is commonest in Poland, the United States, and Netherlands. Very seldom, Sylwiusz is the forename as well as the last name.