Hi Maureen, There are many Jung families in the Neunkirchen area. On Rudi Jung's CD of family books, St. Martin's Neunkirchen/Nahe's family book is listed from 1692-1900. If that is the same Neunkirchen you are speaking of...this would also cover the towns of Gonnesweiler, Selbach, Eckelhausen, Eiweiler and Bosen, plus many others. I "quickly" glanced through, however I didn't see your Johann Jacob Jung listed....(which means nothing...the print's small and I wear bifocals :-) Hope this helps! Karen Adams, Seattle