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Family name ケイジ (Keiji , ケイジ , Cage ) , in the world, is a common cognomen. The cognomen ケイジ is characteristic of Japan, where it is quite a common surname, Angola, where it is quite a rare surname, and the United States. In absolute terms, it most frequently occurs in Japan, the United States, and China. Much less frequently, ケイジ is the forename as well as the last name.