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Cognomen Klok (Klok , Клок , Clocc) , all over the world, is quite a common family name. The last name Klok is habitual in Netherlands, where it is quite a common surname, Denmark, where it is quite a rare surname, and Belarus. Measured by absolute frequency, it is the most numerous in Netherlands, Ukraine, and Russia. Very seldom, Klok is the forename as well as the last name.