I don't know if Nyckowska is a common name as well.
Nyckowska is the female spelling of the name Nyckowski. Currently there are 141 people living in Poland with this surname of which 17 are located in Płock. Have a look at this link which shows the distribution:
moikrewni.pl/mapa/kompletny/nyckowski.html
From what I gather Gordzielewski is a common surname
Only 8 people in Poland with this surname:
moikrewni.pl/mapa/kompletny/gordzielewski.html