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Family name Rha (رحا , Rha , رهى ) , around the world, is quite a rare last name. The cognomen Rha is characteristic of Palestinian Territory, where it is quite a rare surname, Morocco, where it is a rare surname, and Indonesia. Measured by absolute frequency, the name is most common in Indonesia, Morocco, and the United States. More prevalently, Rha is the forename as well as the last name.