The surname changed as the French written language evolved. DUPUI, du Puy, DUPUY, DUPUIS.
The Y-DNA of me Raymond Lee DUPUIS DOB 1966 is R1b1a2-M269 France. I am a DNA match with Paul Andre' DUPUIS of Quebec. We are both related to Michel DUPUIS of France DOB 1637 and Martin DUPUIS of Port Royal Acadia CANADA DOB 1664. Germain DUPUIS DOB 1689, Germain DUPUIS DOB 1772, Francois DUPUIS DOB 1757. Charles DUPUIS DOB 1807, Charles DUPUIS DOB 1845. It is believed we are related to Hugues du Puy of France, Father of Raymond du Puy (1083) and Adolf du Puy, Alleman and Romain du Puy.
Raymond du Puy de Provence, I. Grand Master of the Order of St. John of Jerusalem