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