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Cognomen Denka (Денка , Denka ) , in all the world, is quite a rare last name. The cognomen Denka is characteristic of Bulgaria, where it is quite a common surname, Bhutan, and North Macedonia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Bulgaria, Japan, and Ethiopia. Likewise, Denka is the forename as well as the last name.