These names are quite familiar to me, either because I know someone here with those names or have run into them during my Bohemian research. Vancura especially. But Vodicka, Janosek, Benes also. (One of my student graders was a Benes.) So do you know WHERE in the US these folks settled? Even generally? I know you implied you do not know, but perhaps a region? East coast? Midwest? Do you have any precise birthdates?
According to Sobotka, we have one Vodicka in Nebraska, Josef, and he was from Chlumetin, Hlinsko, Chrudim. We have two Vancuras, Jan from Cinoves, Kr. Mestec, Jicin, and Vaclav from Zbudovice, Caslav. Mat. Vlach from Vilimov, Kolc. Jenikov, Caslav, and a Leonard from the Plsen area. Too many Benes folks to list.