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Cognomen Gâteau (Gato , Gâteau , Gateau ) , in all the world, is a common family name. The last name Gâteau is habitual in Guadeloupe, where it is quite a common surname, Portugal, and Mauritius, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Brazil, France, and Philippines. Much less frequently, Gâteau is the forename as well as the last name.