Thanks to this world map that shows the density of people with the surname Gruszowski in different countries, you can get an idea not only of the popularity of the surname Gruszowski in each country but also of the different migrations of people surnamed Gruszowski.
The quantity of people with the surname Gruszowski that we can find in each country can help us discern the origin of the surname Gruszowski, as logic tells us that the place with the most people surnamed Gruszowski will be the country or area of origin of the surname Gruszowski.