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Family name Clack (Clack , 克拉克 , Клек ) , in the entire world, is quite a common cognomen. The cognomen Clack is characteristic of Reunion, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Australia. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and South Africa. Much less frequently, Clack is the forename as well as the last name.