Using graphic elements like this world map, to see in which countries or regions of the world the surname Guinan is more common, is of great help.
The quantity of people with the surname Guinan that we can find in each country can help us discern the origin of the surname Guinan, as logic tells us that the place with the most people surnamed Guinan will be the country or area of origin of the surname Guinan.
Globalization can make the surname Guinan 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 Guinan greatly aids all those who seek a deeper knowledge about the surname Guinan.