Jenö Endre (Eugene Andrew) appear to be the first names, though it is hard to believe that your partner does not know the precise name of her father. There are Sass and Feke families in Hungary. The term "von" is German and means "from" (also used to designate nobility in German). Therefore, the question is where precisely do you have the name from, in this particular writing? Have you provided all the diacritics on top of vocals? Are you absolutely sure of the spelling of the name?
The "plains near Debrecen" might mean anywhere near Debrecen, as Debrecen is surrounded by plains.
Why did you post at the board for Austria? The first names are definitely Hungarian though you did not give us the diacritics on the vocals.