In this world map, you can check at a single glance which countries have more people with the surname Gruia. As you can see, it's effortless to notice which countries have a higher number of people carrying the Gruia surname.
Thanks to this world map that shows the density of people with the surname Gruia in different countries, you can get an idea not only of the popularity of the surname Gruia in each country but also of the different migrations of people surnamed Gruia.