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Surname Leth (ليث , Lac , Leth ) , around the world, is a common last name. The surname Leth is characteristic of Greenland, where it is quite a common surname, Denmark, and Syria (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Iraq, Syria, and Denmark. Much more frequently, Leth is the forename as well as the last name.