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Surname Unna (Unna , Unn , Унна ) , globally, is quite a rare family name. The cognomen Unna is characteristic of Estonia, where it is quite a rare surname, Malaysia, where it is a rare surname, and Denmark. Not in comparison with a country's population, it is the most numerous in India, Malaysia, and Indonesia. Likewise, Unna is the forename as well as the last name.