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