CASTILLO

Source: Spanish

Root Word: castellum

Derived From: From the Latin root "castrum" (meaning "fortified camp"), "castellum" is a diminutive meaning "small fortress" or "fortified place."

Meaning: castle, fortress

Popularity History: "Castillo" is an extremely common surname in Spanish-speaking countries, particularly in Latin American countries like Spain, Mexico, Colombia, Peru, and Chile. Its popularity is directly related to the prevalence of castles in Europe during the Middle Ages, serving as military, administrative, and residential centers, and their importance as landmarks. Numerous towns and villages bear the name "Castillo," further solidifying its popularity as a surname.