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