The earliest known ancestor is Guillaume DuPont, who lived in the parish of St-Nicolas in Rouen in the mid-seventeenth century, and worked as a second-hand clothing dealer. (The map above shows the neighborhood, with the church circled; it is quite near the cathedral of Rouen.) His wife's name was Anne Julliot. We know of nine children born in the parish: Anne (1162), Marie (1665), Alexandre (1666), Elisabeth (1669), another Marie (1670), Catherine (1673), Lucas (1674), Marie-Marthe (1676), and the immigrant ancestor, also named Gillaume DuPont, who was baptised at St-Nicolas on March 26, 1664. He probably came to Québec in 1689; he first appears in the records in that year as a tailor working in Québec city.

Gillaume Dupont dit Leblond (1664-1730) married first Marie-Madeleine Michel (daughter of Olivier Michel dit LeTardif et Taillon and Marie-Madeleine Cauchon) at Nôtre-Dame in Québec city on January 12, 1693. We do not know the reason for the "dit" name; presumably he was blond. The couple had five children before Marie-Madeleine died in 1702 (giving birth to their son Nicolas, who also died). Gillaume then remarried: Anne Trottain (daughter of François Trottain de Saint-Surin and Jeanne Hardy), by who he had three more children: Marie-Anne (1705), François (1017), and Noël (1710), our ancestor.

Noël-Marie Dupont married Marie-Angélique Morneau in February 1737 at L'Islet. They were the parents of nine children: Noël-François (born 1737 at Cap St-Ignace); Charlotte (1739, Cap St-Ignace, married Louis-Marie Gamache); Jean-Baptiste-Benjamin (1741, L'Islet, married Marie-Anne Girouard); Marie-Geneviève (1742-1743); Marie-Angélique (1744, L'Islet, married Adrien Ménard); Marie-Claire (1746, L'Islet, married Jean-Baptiste Gaudreau); another Marie-Geneviève (1748, L'Islet); Joseph-Marie (1750, L'Islet); and Catherine (1753, L'Islet, married Alexandre Saint-Pierre.

For the descendants of Marie-Claire and Jean-Baptiste Gaudreau, see Gaudreau.