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Last name Arth (Arthur , Arth , Arnth ) , across the world, is a widespread family name. The cognomen Arth is characteristic of Ghana, where it is a common surname, Saint Vincent and the Grenadines, and Barbados (explore the name in all countries). In absolute terms, the name is most common in Ghana, the United States, and the United Kingdom. More prevalently, Arth is the forename as well as the last name.