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Cognomen Iohn (Jehan , Iohn , Йохн ) , in all the world, is a common last name. The last name Iohn is habitual in Guernsey, where it is quite a common surname, Jersey, and Pakistan, where it is quite a rare surname. In absolute terms, the name is most common in Pakistan, Malaysia, and France. Also, Iohn is the forename as well as the last name.