In this world map, you can check at a single glance which countries have more people with the surname Janser. As you can see, it's effortless to notice which countries have a higher number of people carrying the Janser surname.
The quantity of people with the surname Janser that we can find in each country can help us discern the origin of the surname Janser, as logic tells us that the place with the most people surnamed Janser will be the country or area of origin of the surname Janser.