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Cognomen Arum (Arum , Aro , Арум ) , all around the world, is a common last name. The cognomen Arum is characteristic of Finland, where it is quite a common surname, Estonia, and Indonesia (explore the name in all countries). Measured by absolute frequency, the name is most common in Indonesia, Nigeria, and Philippines. Likewise, Arum is the forename as well as the last name.