Thanks to this world map that shows the density of people with the surname Grigorciuc in different countries, you can get an idea not only of the popularity of the surname Grigorciuc in each country but also of the different migrations of people surnamed Grigorciuc.
The quantity of people with the surname Grigorciuc that we can find in each country can help us discern the origin of the surname Grigorciuc, as logic tells us that the place with the most people surnamed Grigorciuc will be the country or area of origin of the surname Grigorciuc.