Dupin is a French surname. Notable people with the surname include:Amantine Lucile Aurore Dupin (1804–1876), more commonly known as George Sand, French writer André Marie Jean Jacques Dupin (1783–1865), French advocate C. Auguste Dupin, a fictional detective Charles Dupin (1784–1873), French Catholic mathematician Jacques Dupin (1927–2012), French poet Louis Ellies Dupin (1657–1719), French ecclesiastical historian Mademoiselle Dupin (1649-1709), French actress