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Family name Idu (Idu , Oidu ) , all around the world, is quite a common last name. The family name Idu is characteristic of Romania, where it is quite a rare surname, Nigeria, and United Arab Emirates, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Nigeria, India, and Romania. More prevalently, Idu is the forename as well as the last name.