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Family name Inthavong (Inthavong ) , in the entire world, is a common cognomen. The cognomen Inthavong is characteristic of Laos, where it is a widespread surname, Australia, where it is a rare surname, and France. Measured by absolute frequency, it is the most numerous in Laos, the United States, and Thailand. Very seldom, Inthavong is the forename as well as the last name.