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Cognomen Idem (Idem , Ідем , Идем) , all around the world, is quite a rare last name. The last name Idem is habitual in Nigeria, where it is quite a rare surname, Norway, where it is a rare surname, and Nicaragua. Not in comparison with a country's population, it most frequently occurs in Nigeria, India, and Algeria. Likewise, Idem is the forename as well as the last name.