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Cognomen Yohn (Yohn , Йон , يوهان ) , in the world, is quite a rare surname. The surname Yohn is characteristic of Bulgaria, where it is quite a common surname, Armenia, where it is quite a rare surname, and Venezuela, where it is a rare surname. Measured by absolute frequency, it is the most numerous in the United States, Bulgaria, and Colombia. Also, Yohn is the forename as well as the last name.