Steffl - not a Czech origin surname, but often used in different forms: Štefl, Šteffel, Steffel, Štefela, ... Slivencha - ??, may be Slivenský, Slíva, Slivanský, Slivečka, ... Plechaty - Czech origin Plechatý Koenigsmark - german surname Königsmark, Koenigsmarck or Koenigsmark