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Last name Киллен (Killen , Киллен ) , in all the world, is quite a common surname. The surname Киллен is habitual in Ireland, where it is quite a rare surname, Australia, and Liberia. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Киллен is the forename as well as the last name.