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Surname Siil (Siil ) , around the globe, is a rare family name. The surname Siil is habitual in Estonia, where it is quite a common surname, Guatemala, where it is a rare surname, and Finland, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Estonia, Guatemala, and the United States. Also, Siil is the forename as well as the last name.