Kowalczyk is an extremely popular surname in Poland.
As for Marusarz and Zakopane - Jan, Stanisław and Helena represented Poland in winter sports before the war. They were also couriers because of their excellent skiing skills. Helena was killed after being captured by Germans. You can read about them online.
It's hard to say if you're related.
There are over 5000 Reszkas in Poland according to moikrewni.pl. but only 36 Klosseks - six of them live in Katowice - there's even a bakery (piekarnia) run by a Klossek family in Katowice.