The Spanish surname Diaz is derived from the Latin word dies meaning "days." The surname Diaz is first found in Castille in Spain and dates there from Visigoth times. Diaz is first recorded as a last name in Spain in the 9th Century. Bernal Diaz del Castillo travelled to Cuba in the 16th Century and then accompanied Herman Cortes to Mexico. The name Diaz is the 14th most common Hispanic surname in the United States and the 72nd most common overall. Approximately 150,000 bearers of the name Diaz live in the US.
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