Castellanos is a Spanish habitational surname with the meaning "(from a place founded or inhabited by) Castilians". Notable people with the surname include:

Answer this question based on the passage: where does the last name castellanos originate from? Okie... think carefully first, then make a decision:
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The relevant information is: Castellanos is a Spanish habitational surname with the meaning "(from a place founded or inhabited by) Castilians". So, the answer is Spanish.
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