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