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Family name Penu (Penu , Пену , ปากกา ) , all over the world, is quite a rare cognomen. The surname Penu is characteristic of Estonia, where it is quite a common surname, Romania, where it is quite a rare surname, and Ghana. Not in comparison with a country's population, it is commonest in Indonesia, Romania, and Ghana. Likewise, Penu is the forename as well as the last name.