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