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Around the world, Siim (Siim , Сиим , Сіім ) is a rare unisex forename. The first name Siim is characteristic of Estonia, where it is quite a common male name, Israel, where it is quite a rare female name, and Finland, where it is a rare boy's name. In absolute terms, it most frequently occurs in Estonia, Israel, and Morocco. Likewise, Siim is the last name as well as the forename.