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Last name Dek (Dec , Dek , เด็ก ) , in the entire world, is a common cognomen. The cognomen Dek is habitual in Poland, where it is quite a common surname, Mongolia, where it is quite a rare surname, and Algeria. Measured by absolute frequency, it is commonest in Poland, China, and Indonesia. Likewise, Dek is the forename as well as the last name.