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Last name Kagi (Kagi , 鍵 , Каги ) , globally, is quite a common cognomen. The cognomen Kagi is characteristic of Switzerland, where it is quite a common surname, Estonia, where it is quite a rare surname, and Oman. Measured by absolute frequency, the name is most common in India, Switzerland, and Iran. Much less frequently, Kagi is the forename as well as the last name.