In this world map, you can check at a single glance which countries have more people with the surname Fierro. As you can see, it's effortless to notice which countries have a higher number of people carrying the Fierro surname.
Thanks to this world map that shows the density of people with the surname Fierro in different countries, you can get an idea not only of the popularity of the surname Fierro in each country but also of the different migrations of people surnamed Fierro.
The quantity of people with the surname Fierro that we can find in each country can help us discern the origin of the surname Fierro, as logic tells us that the place with the most people surnamed Fierro will be the country or area of origin of the surname Fierro.