Hungarians with that surname.
Surnames should not confused with ethnicity. There are 100% Poles with names liek Schultz, Bardini, Ferenc and Romanow, Germans named Nowak, Kaminski nd Lewandowski, Frenchmen named Pikuta, Mazurek, Orsini, Glauber and Jews with any of the above. The fact that some Hungarian is named Łopatowski (I doubt if he'd have a slash through the letter Ł) does not make it a Hunagrian name.