Kara,
Tina gave some good suggestions which I hope you have been able to work on. The idea of Felgentraeger as 'your' surname seems to have potential, however you are bound to encounter many variations! If there is a German background the family would most likely be Evangelical (Lutheran) - do you know what religion they were?
There are now images for Evangelical records at
http://www.szukajwarchiwach.pl/63/194/0/1#tabSerieBronwyn.