The quantity of people with the surname Kotilainen that we can find in each country can help us discern the origin of the surname Kotilainen, as logic tells us that the place with the most people surnamed Kotilainen will be the country or area of origin of the surname Kotilainen.
Globalization can make the surname Kotilainen 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 Kotilainen greatly aids all those who seek a deeper knowledge about the surname Kotilainen.