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Cognomen Gerardy (Gerardy , Герарди ) , in the world, is quite a rare family name. The cognomen Gerardy is characteristic of Belgium, where it is quite a rare surname, Luxembourg, and Canada, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Belgium, the United States, and Germany. Also, Gerardy is the forename as well as the last name.