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