Gaius

• (praenominal abbreviation): C., G. (less frequently)
• (archaic or hypercorrect): Cāius, Cājus
• Gājus

For Gāvius, from Proto-Italic *Gāwjos, a derivative of Proto-Indo-European *geh₂w- (“to rejoice”). Cognate with gaudeō, gaudium. Cognate with Etruscan 𐌂𐌀𐌄 (cae).

• (Classical Latin) IPA^(key): [ˈɡaː.i.ʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈɡaː.i.us]
• (Late Latin, common variant) IPA^(key): [ˈɡaj.jʊs]

Gāius m (genitive Gāiī or Gāī, feminine Gāia); second declension

1. A masculine praenomen, in particular:
   1. Gaius (an eminent jurist who lived in the second century A.D.)
   2. Caligula, the emperor Gaius Julius Caesar Augustus Germanicus

   Qui totus servatus est in Gaiorum et Quintorum laterculis.^source

   Which was kept in its entirety on the registers of Gaiuses and Quintuses.

• 1876, "C" in the Encyclopædia Britannica, 9th ed., Vol. IV, page 616:

  The symbol [C] retained its old value [/ɡ/] only when as the initial letter it represented the names and Gnæus, which, in consequence, are often erroneously written and sounded Caius and Cnæus.

Second-declension noun.

¹Found in older Latin (until the Augustan Age).

• Gāia f (praenomen)
• Gāiānus (“of, pertaining to Caligula”, adjective)
• Gāīpor (“male slave of Gaius”)

• → German: Gajus
• → Indonesian: Gayus
• → Ancient Greek: Γάϊος (Gáïos)
• → Coptic: ⲅⲁⲓⲟⲥ (gaios)
• → Etruscan: 𐌂𐌀𐌉𐌄 (caie)
• Georgian: გაიუსი (gaiusi)
• Italian: Gaio, Caio
• Portuguese: Gaio, Caio
• Russian: Гай (Gaj) (possibly)
• Spanish: Gayo

• “Gaius”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• Gaius in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.