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