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Last name Jex (Jex , جيكس ) , throughout the world, is quite a rare cognomen. The last name Jex is habitual in Belize, where it is quite a common surname, Isle of Man, where it is quite a rare surname, and Slovakia. In absolute terms, it is the most numerous in the United States, the United Kingdom, and Indonesia. Very seldom, Jex is the forename as well as the last name.