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