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Cognomen Magny (Magny , Магний ) , in all the world, is quite a rare family name. The family name Magny is habitual in France, where it is quite a rare surname, Haiti, and Mauritius. Not in comparison with a country's population, this name is the most popular in France, Canada, and Cameroon. Much less frequently, Magny is the forename as well as the last name.