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