Surname Gnadzinski not occur in Poland. However, surname Gradzinski;http://www.moikrewni.pl/mapa/kompletny/gradzi%25C5%2584ski.h...
is a rare and occurs in the neighboring [for Pysznica] district of Sandomierz [red on map].
I think that the hand-written "r" in documents from Poland,was frequently reported as "n" in USA.
Also writer in the USA parish which was speaking English, phonetically written to book [as he heard] surname Gniod Zeski , which not occurs in Poland.