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Cognomen Guay (Vae , جواي , Guay ) , throughout the world, is a common surname. The last name Guay is characteristic of Canada, where it is quite a common surname, New Zealand, where it is quite a rare surname, and Guatemala. In absolute terms, this name is the most popular in Canada, the United States, and Philippines. Very seldom, Guay is the forename as well as the last name.