In this world map, you can check at a single glance which countries have more people with the surname Niggli. As you can see, it's effortless to notice which countries have a higher number of people carrying the Niggli surname.
Using graphic elements like this world map, to see in which countries or regions of the world the surname Niggli is more common, is of great help.
Thanks to this world map that shows the density of people with the surname Niggli in different countries, you can get an idea not only of the popularity of the surname Niggli in each country but also of the different migrations of people surnamed Niggli.