hi suemoore6436
the site is easy to use. you can test and show different spellings. type the name:

Mapa nazwisk: type here the name
butten szukaj = search

test it with the name Mroszewska

you can see there are 2 entries and where. the map shows: how many people live there with this family-name.

to your spelling:

did you mean : ß (german buckel-s = sz = ss)

Mroszowski