Surnames: Hrebec, Bokor, Trcka, Hrach

I’ve just joined the CGSI and have been looking for information about my grandparents who emmigrated from Bohemia around 1888. Mathias and Anna Hrebec and Lawrent and Mary Trcka came to St. Louis and settled in the area of Bohemian Hill close to the Mississippi River. The Trcka’s practiced their Catholic religion while the Hrebec’s were Catholic in name only. I’d be delighted to hear from anyone with connections to these surnames.