Winskowski
It's just a very, very rare surname, with only about two dozen people in Poland bearing that name. On the good side, it belongs to only a single family, so anyone with that surname is related to you within four or five generations at the most. Also, it almost certainly originated in a single concrete place near Ruda Ślaska in southern Poland. People with that surname still live there today, and finding the parish where records on the family are kept will be easy.