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Surname Diaku (Diaku ) , globally, is a rare last name. The last name Diaku is characteristic of Angola, where it is a rare surname, Nigeria, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Angola, Nigeria, and the United States. Also, Diaku is the forename as well as the last name.