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