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