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