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