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Surname Jóan (約翰 , Йохан , Jóan ) , throughout the world, is a rare family name. The family name Jóan is characteristic of Bulgaria, where it is a rare surname, Iran, where it is a very rare surname, and Russia. In absolute terms, it is commonest in China, Bulgaria, and Russia. More frequently, Jóan is the forename as well as the last name.