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Cognomen Flack (Flack
, فلک
, فلاك) , in the entire world, is a common surname. The family name Flack is habitual in Isle of Man, where it is quite a common surname, Reunion, and the United Kingdom, where it is quite a rare surname. In absolute terms, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Flack is the forename as well as the last name.