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Surname Roub (Roub , Руб ) , in the world, is quite a rare cognomen. The surname Roub is characteristic of Czechia, where it is quite a rare surname, Algeria, where it is a rare surname, and Armenia. Measured by absolute frequency, this name is the most popular in Czechia, Indonesia, and the United States. Much less frequently, Roub is the forename as well as the last name.