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Family name D'Aoust (D'Aoust ) , globally, is a rare surname. The last name D'Aoust is habitual in Canada, where it is quite a rare surname, Belgium, where it is a rare surname, and New Zealand. Measured by absolute frequency, this name is the most popular in Canada, Belgium, and the United States. Much less frequently, D'Aoust is the forename as well as the last name.