My name is Jan Ferencz and I am also researching on the Ferencz name. We haven't been able to come up with a lot, but maybe something will ring a bell. Grandfather ANTON W. FERENCZ b.1880 in Sosvar, Hungary (haven't yet found out where Sosvar is, probably mispelled) emigrated to US in 1902, married ZUZI MIKO (b.1890 in Hethars, Hungary )in 1909. Lived in Blairsville, PA and owned a Hardware store. Had 3 sons Paul E. b.1913, George P. b 1922 and William R. b.1925. Really not sure if he was Hungarian or Slovakian. ANTONS parents names were PAUL and KAROLINA FERENCZ.
We are guessing that he had other family in PA. Good luck.