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Cognomen ארנו (Arnaud , Arno , Ernő ) , around the globe, is a common surname. The cognomen ארנו is characteristic of Martinique, where it is quite a common surname, France, and Aruba (explore the name in all countries). Measured by absolute frequency, the name is most common in France, Ivory Coast, and Cameroon. More frequently, ארנו is the forename as well as the last name.