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