I have found in Internet the genealogy of the surname of my mother and I have discovered that our possible origins are in Vizcaya. ¡We can have had ancestors into some famous Basque explores and adventurous! No bad.
My research in Internet have obtained the following results: More than a 25% of Spanish people use one of these fifteen surnames (Fernández, González, Rodríguez, López, Martínez, Sánchez, Pérez, Martín, Gómez, Ruiz, Díaz, Hernández, Jiménez and Álvarez). This is incredible, inst' it?