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