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