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