The origin of surname is Castilla is the mountains of Santander where it spreads all over Spain.

He proved his nobility in the military orders of Santiago, Calatrava, Alcantara and Charles III.

The origin of the lineage appears to be the knight Lopez de Castillo who was next to King Alfonso XI in numerous battles against the Moors.

The origin of the name seems to be the Latin word Castellun meaning castle.

Some variations of this surname are: Castlla, Castillo and others.