In this world map, you can check at a single glance which countries have more people with the surname Rousselot-pailley. As you can see, it's effortless to notice which countries have a higher number of people carrying the Rousselot-pailley surname.
Using graphic elements like this world map, to see in which countries or regions of the world the surname Rousselot-pailley is more common, is of great help.