Castellanos is a Spanish surname with a documented presence across Europe, Latin America and the United States. The name derives from the Iberian word castellano, denoting a castle or fortress. It is understood to have arisen as a locational surname for those who lived near a castle or who held a function within one, and it has been associated with a range of Roman and medieval occupational titles.

The etymology can be traced to the Latin root castellum, meaning a fortification. In the pre‑Christian era, the term castellanus referred to an official who governed a castle or managed a prison. Over time the name survived in a number of orthographic varieties, including Castellan, Castellano, Castellain, Castelan, Castelanho and Castella. In the Anglo‑Saxon records a form appears as Osbert Castelyn in 1240. The persistence of this surname across multiple languages reflects its status as an occupational or locational marker of authority.

Coat of arms traditionally associated with the name features a red field and a castle depicted in natural colours, surrounded by a silver border. Within this border are numerous gold lions rampant. This heraldic description is typically rendered as a red field, a castle proper, inside a silver border with a semée of gold lions rampant.

Geographically, the surname is most common in Spain, particularly within the provinces of Andalusia, Asturias, Castilla La Mancha, Galicia and Madrid. In Latin America, the name is especially widespread in Mexico, Honduras, Nicaragua, Costa Rica and Panama, where early records are found in civil and church registers from the colonial period. Within the United States, California hosts the largest number of individuals bearing the name, with significant populations also in Florida, Texas, Arizona and New York.

In addition to the principal form, the name has been merged with other surnames, producing hyphenated combinations such as Castellano‑Leyva, Castelano‑Guerrero and Castillo‑Castellanos. The many variants of spelling include Castell, Castellanu, Castello, Castelo, Castilla, Castinelli, Castillón, Castilio, Castillos, Castillon, Castzyk, Kastelano, Kastelan, Kastellanos, Kastilio, Kastillo and Kastilon.

Historical figures of note who have carried the name include Luis Castellanos (1923–2012), an Argentine lawyer and political adviser to several presidents; Jorge Castellano, a Spanish actor and director; and Pedro Duque Castillo, a Spanish astronaut and navigator. These individuals, among others, illustrate the surname’s association with public service and cultural achievement.

The persistence of the surname in diverse regions underscores the enduring influence of medieval toponymic and occupational naming practices. Its continued use across continents demonstrates how a familial identity that originated in a specific social context can maintain relevance over centuries, while remaining firmly rooted in the historical narrative of castle guardianship and local residence.

Similar and related surnames

Related and similar names are generated algorithmically based on the spelling, and may not necessarily share an etymology.

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There are approximately 88 people named Castellanos in the UK. That makes it one of Britain's least common surnames. Only around one in a million people in Britain are named Castellanos.

Origin: Iberian

Region of origin: Europe

Country of origin: Spain

Religion of origin: Christian

Language of origin: Spanish

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