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Gaius \gaius\ as a boy's name is of Latin origin, and the meaning of Gaius is "happy, rejoice". Probably the root of the word "gay", which used to mean "jolly". Also a biblical name, and the name of a Roman jurist in the second century. Caius is a variant that occurs in England. Gaius has 7 variant forms: Cai, Caio, Kay, Kaye, Keye, Keyes and Keys. For more information, see also the related name Jay. Baby names that sound like Gaius are Gus and Guus. View a list of the 4 names that reference Gaius.

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