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Cognomen Daoust (Daoust , Aoust ) , all around the world, is quite a common family name. The last name Daoust is characteristic of Canada, where it is quite a common surname, Belgium, where it is quite a rare surname, and New Zealand. Not in comparison with a country's population, the name is most common in Canada, the United States, and Belgium. Very seldom, Daoust is the forename as well as the last name.