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