Mapa De Apellidos is a surname mapping tool in Spain and other countries. This is a free website and also an App for Android phones. Select the language you’d in which like the site to present instructions. In the upper right-hand corner of the map box, there’s a search window. Type a surname and select Search & the site will display the frequency and distribution of that surname across a map of Spain (or a country linked below).
This site also has surname maps for the following countries: