Daoust, D'Aoust, Deault or Dault is a common French language surname, people with this family name can be found in most of Canada (especially in Quebec, Eastern Ontario), the USA and Belgium. It literally translates as (born) in August or (born) in Summer. Although others suggest that it means someone from the village of Aouste in the Ardennes region of France, near Laon. The D apostrophy would indicate being of (de) Aouste, as the Italians use 'di' as in Di Maggio.
- Charles Daoust (1825–1868), politician of Canada East
- Jean-Baptiste Daoust (1817–1891), MP for Deux-Montagnes, Quebec
- Sévère D'Aoust, first colonizer of Sarsfield, Ontario
- Sylvia Daoust, C.M., C.Q., A.R.C. (1902–2004), sculptor
- Dan Daoust, NHL Hockey Player (Center), 1982-83 Montreal Canadiens and 1983-1990 Toronto Maple Leafs
- Daoust's Corner, former name of Sarsfield, Ontario region prior to 1874
- A brand of Ice Skates made by Micron.
- Marianne Mulon, Origine et histoire des noms de famille : Essais d'anthroponymie, Editions Errance, Paris, 2002, coll. Des Hesperides, 196p.
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