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Cognomen Slate (Slate , Esclate , سليت ) , in all the world, is quite a common surname. The last name Slate is characteristic of the United States, where it is quite a rare surname, Nicaragua, and Syria, where it is a rare surname. Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Syria. Very seldom, Slate is the forename as well as the last name.