Using graphic elements like this world map, to see in which countries or regions of the world the surname Roa is more common, is of great help.
The quantity of people with the surname Roa that we can find in each country can help us discern the origin of the surname Roa, as logic tells us that the place with the most people surnamed Roa will be the country or area of origin of the surname Roa.
Globalization can make the surname Roa be found in almost every country around the globe, but being able to see the density of people residing in a country with the surname Roa greatly aids all those who seek a deeper knowledge about the surname Roa.