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