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