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