Meaning of the surname Castillo
Castillo is a Spanish surname of the from a place type meaning "castle". It is one of the 50 most common surnames in Mexico. Twenty-fifth in Mexico.
Taken from a town, region, or landscape feature in Spain, or later in Mexico: Castillo (castle), Rivera (riverbank), Navarro (from Navarre), Ibarra (Basque valley).
In Mexico a person carries two surnames, the father's and then the mother's, so Castillo appears as either half of a pair: Castillo García, López Castillo. Read how the two-surname system works.