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