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Cognomen Lambertus (Lambertus ) , in all the world, is quite a rare family name. The cognomen Lambertus is habitual in Aruba, where it is quite a common surname, Hungary, where it is quite a rare surname, and the Dominican Republic. Measured by absolute frequency, it most frequently occurs in Indonesia, Germany, and the United States. More frequently, Lambertus is the forename as well as the last name.