In this world map, you can check at a single glance which countries have more people with the surname Ohagan. As you can see, it's effortless to notice which countries have a higher number of people carrying the Ohagan surname.
The quantity of people with the surname Ohagan that we can find in each country can help us discern the origin of the surname Ohagan, as logic tells us that the place with the most people surnamed Ohagan will be the country or area of origin of the surname Ohagan.