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Family name Cujo (Cujo , كوجو , Cuje ) , across the world, is quite a rare surname. The family name Cujo is characteristic of Slovenia, where it is quite a rare surname, Iraq, where it is a rare surname, and Saudi Arabia. In absolute terms, the name is most common in Iraq, Sudan, and Saudi Arabia. Much less frequently, Cujo is the forename as well as the last name.