The quantity of people with the surname çay that we can find in each country can help us discern the origin of the surname çay, as logic tells us that the place with the most people surnamed çay will be the country or area of origin of the surname çay.
Globalization can make the surname çay be found in almost every country around the globe, but being able to see the density of people residing in a country with the surname çay greatly aids all those who seek a deeper knowledge about the surname çay.