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Cognomen Spet (Speta , Spet ) , around the globe, is a rare surname. The family name Spet is characteristic of Czechia, where it is quite a rare surname, Austria, and Lithuania, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Czechia, Austria, and the United States. Much less frequently, Spet is the forename as well as the last name.