My great great grandmother was Bridget O'Konek. She was married to Jacob Cychosz. They had two children, Joseph and Martha.
Bridget was born in the US about 1864, shortly after her parents (Valentine O'Konek and Catherina Kulwikowska) immigrated. She was married young, around 16, and died around 1883 or 1884. Jacob remarried Anna Poblocki and had many other children.
I believe that Valentine had a brother named Mathius. And, Mathius had a son (and other children) named Peter.
The family lived in the Stevens Point, WI area.