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