I found the origins of the Jan Vlasak family in Bohemia. I used the shipping records from Hamburg to narrow down the village, then Actapublika to search the church records. I hired a genealogist in Prague to translate the records. The Jan Vlasak family lived in Vitejovice before they immigrated to the U.S. Before that they lived in Poderiste back to the 1650s. Contact me if you want the records. Marketa Popp's family lived in Hracholusky.