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The surname Coulet Diaz is of French and Spanish origin. The first part, Coulet, is likely of French descent and is a toponymic surname derived from the word "col," meaning hill or mountain pass. This suggests that the original bearers of the surname may have lived near or on a hill or mountain pass in France. The second part, Diaz, is of Spanish origin and is a patronymic surname meaning "son of Diego." This indicates that the ancestors of those with the surname Coulet Diaz may have had Spanish heritage and were descendants of a man named Diego. The combination of these two surnames suggests a mix of French and Spanish ancestry within the family history.
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