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Last name Peny (Penny , Peny , Πενυ ) , in all the world, is a common surname. The family name Peny is habitual in Grenada, where it is quite a common surname, Namibia, and Reunion. Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Australia. More prevalently, Peny is the forename as well as the last name.