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Last name Caïus (Caïus ) , in the world, is an extremely rare family name. Predominantly, Caïus is the forename as well as the last name.
Caio, Caiu, Caius, Gaius, Kae, Kaio, Kajo, Kajs, Kajus, Гай, גאיוס, and 盖乌斯
Ort, Marcius, and Ndikumana