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Cognomen Haddock (Haddock , Hadoc , Adag ) , all over the world, is a common family name. The family name Haddock is habitual in Isle of Man, where it is quite a common surname, Puerto Rico, where it is quite a rare surname, and the United Kingdom. In absolute terms, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, Haddock is the forename as well as the last name.