Thanks to this world map that shows the density of people with the surname Petra in different countries, you can get an idea not only of the popularity of the surname Petra in each country but also of the different migrations of people surnamed Petra.
Locating at a single glance the countries where the surname Petra is more abundant, as well as the areas of the globe where there are hardly any people with the surname Petra, is of great utility for individuals interested in surnames, and specifically in the surname Petra, as it allows them to quickly and easily visualize the data and its distribution."