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Family name Sylweriusz (Sylweriusz ) , across the world, is a rare cognomen. The cognomen Sylweriusz is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname. Much less frequently, Sylweriusz is the forename as well as the last name.
Bak, Kuran, Krlak, Kalita, Nickel, Fidura, Adynowski, Pokropek, Krajewski, Pawlowski, Paczkowski, Wawrzyniak, and Korytkowski