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Surname Etymology and Meaning of CASTRO

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Name meanings and etymologies are often disputed. The information here is compiled from freely available sources, and no claims whatsoever are made for accuracy, either historical or etymological.

Galician, Portuguese, Italian, and Jewish (Sephardic): topographic name from castro ‘castle’, ‘fortress’ (Latin castrum ‘fort’, ‘Roman walled city’): in Galicia and also in northern Portugal a habitational name from any of various places named with this word; in Italy either a topographic name or a habitational name.

Source: Dictionary of American Family Names (2003)