I'm looking for my relatives in US. My grand mother told me about Rozarka (Rosary) Kotkova (Kotek) who get to US around WW I, she was very young in that time, then she married Mr. Pardubsky or Pardupsky, they had 2 children (boy and girl). I think that they sattled in Chicago or around there. Her husband died after WW II and I think that she remarried. Rosary was from Pilsen (Plzen). Her family (Kotek) came to Plzen from Bustehrad, both places in Czech Republic now, formerly Austro-Hungarian Emperor.
If it fits to your info of Kotek kindly let me know.
Jiri Kotek, Pilsen