As for the Jilk ancestry,my great-grandfather George Jilk (b: 1881), lived in Pierce County. Before living here, he lived in Dane County. I believe it is somewhere near Jefferson. There are many Jilks/Yelks in Sun Prarie, and I have been told they are of relation to us.
It seems I have hit a brick wall though. I am searching for George's parents, siblings, ancestry, origins, et cetera. The problem is that his last name was originally Yelk. When he came to Pierce County, he took out a loan to farm.. the banker could not read George's signature, and therefore thought his last name was Jilk. Instead of going through the hassle of having it changed, he wanted just to get settled and left the last name as is. Now, all the Yelk family in this area has the last name of 'Jilk.'