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Family name Rouby (Rouby ) , in all the world, is quite a rare surname. The cognomen Rouby is characteristic of France, where it is quite a rare surname, Egypt, and United Arab Emirates, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in France, Egypt, and Saudi Arabia. Much less frequently, Rouby is the forename as well as the last name.