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Cognomen Tarto (Tarto , Tarta , Tart ) , in the entire world, is quite a common last name. The cognomen Tarto is characteristic of Estonia, where it is quite a common surname, Romania, where it is quite a rare surname, and the United States, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Indonesia, and Romania. Very seldom, Tarto is the forename as well as the last name.