The last name Jean Eustache is of French origin. "Jean" is a common French given name, while "Eustache" is a French surname derived from the Latin name Eustachius. Eustachius was a Roman martyr and saint, and the name was popularized in France during the Middle Ages. The combination of "Jean" and "Eustache" likely indicates a family connection to someone named Jean and someone with the surname Eustache.
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