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Cognomen Rho (Rho , ロー , โร ) , around the world, is a common last name. The surname Rho is habitual in South Korea, where it is quite a common surname, Italy, where it is quite a rare surname, and New Zealand, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in South Korea, Italy, and the United States. Very seldom, Rho is the forename as well as the last name.