The children of Frank Cervenka and Marie Hrabak in western PA became Swinkers by accident of spelling when my GF went to school.
Marie had at least one brother John in Fayette Co PA, Dunbar Township area---he was born in Bohemia. His children include John, b 1895 and Ella b.1895in PA--mother Marie Vild. There may have been another brother who immigrated, I have not found yet. There are several families in the area.