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