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Cognomen Gregoire (Gregoire , Grégoire , צבי ) , throughout the world, is a common surname. The surname Gregoire is characteristic of Dominica, where it is a common surname, Belgium, where it is quite a common surname, and Mauritius (explore the name in all countries). In absolute terms, the name is most common in France, Canada, and the United States. Also, Gregoire is the forename as well as the last name.