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Blanchette is a French-Canadian alteration of Blanchet, and you can check out their relative frequency in Québec at http://www.yellow.ca/ps/. Blanchet is just one of the many derivatives of blanc 'white'. Your ancestor was Pierre Blanchet (Noël and Madeleine Valet) from Rosières-en-Santerre in the département of Somme (Picardie) who married Marie Fournier (Guillaume and Françoise Hébert) in Québec City in 1670.