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Surname Freng (Freng ) , worldwide, is a rare family name. The surname Freng is characteristic of Northern Europe, particularly Isle of Man, where it is quite a rare surname, Norway, where it is a rare surname, and the United Kingdom, where it is a very rare surname. In absolute terms, the name is most common in the United States, the United Kingdom, and Norway. Very seldom, Freng is the forename as well as the last name.