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Cognomen Йоонас (Jonni , Joonas , Jonass ) , around the world, is quite a rare family name. The cognomen Йоонас is characteristic of Estonia, where it is quite a common surname, Latvia, where it is quite a rare surname, and Mauritius. Measured by absolute frequency, it most frequently occurs in Indonesia, Estonia, and Latvia. More frequently, Йоонас is the forename as well as the last name.