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