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Surname Riisa (Riisa , นะกะ ) , globally, is a very rare last name. The last name Riisa is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname, Norway, where it is a rare surname, and Finland, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Estonia, Norway, and Thailand. More frequently, Riisa is the forename as well as the last name.