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Last name Hackl (Hackl , هاكل) , all over the world, is a common cognomen. The surname Hackl is characteristic of Austria, where it is quite a common surname, Germany, where it is quite a rare surname, and Bosnia and Herzegovina. Not in comparison with a country's population, it is commonest in Austria, Germany, and the United States. Very seldom, Hackl is the forename as well as the last name.