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Family name Gaidi (Guide , Gaidi , 改娣 ) , in all the world, is quite a common surname. The surname Gaidi is habitual in Bhutan, where it is quite a common surname, Tunisia, where it is quite a rare surname, and Algeria. Not in comparison with a country's population, the name is most common in Tunisia, Algeria, and Indonesia. Likewise, Gaidi is the forename as well as the last name.