Perhaps the name Gaius is derived from Gaia, as Gaius may be a masculine form of that name. Just a theory, probably not right.
The pronunciation rules are contradictory: Gā-ǐ-us [ˈɡaː.ɪ.ʊs]
The English rules result in something like "GAY ih us" (in American English). The Latin IPA rules result in something like "GAW ee us".
Too many Gaii?
Looking at this list, I'm wondering if Wikipedia is trying too hard to be inclusive. For most of these people, the praenomen "Gaius" is usually ignored; for example, yes his full name is "Gaius Julius Caesar", but the vast majority of references to him simply call him "Julius Caesar". There are really only a few historical people who are known simply as "Gaius": the jurist, the person in the Bible, & an alternative name for Caligula. (I happen to own a copy of E. Mary Smallwood's Documents Illustrating the Principates of Gaius, Claudius and Nero -- there Smallwood routinely refers to Caligula as "Gaius".) IMHO, these are the only people whom the name "Gaius" might pose confusion. -- llywrch (talk) 19:30, 23 June 2016 (UTC)