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