Goralczyk, I heard was from 'the mountains'. My Dad said that is grand-dad was from Austria, and my grandmonther said her mother was from Kat-something or Cat-something but not the main city Kawcrow.
Originally probably Góralczyk but both forms exist in Poland. Goralczyk is found mainly around Katowice, Góralczyk mainly around Kraków Wadowice also around Kolno NE Poland. Eastern Polish patronymic turned-surname probably meaning son of a highlander, but if you prefer Hillbilly it's OK too.