LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Caius

Caius m sg (genitive Caiī or Caī)
Classical[ˈkaj.jʊs]Ecclesiastical[ˈkaː.jus]

Meaning

  1. New Latinmasculinesingulara surname from English — famously held by
  2. New LatinmasculinesingularJohn Kays (1510–1573), English physician.

Declension

declension
formsingularplural
nominativeCaius—
genitiveCaiī
Caī		—
dativeCaiō—
accusativeCaium—
ablativeCaiō—
vocativeCaī—

Cāius, v. Gaius.

Origins

From English Kays + Latin -ius.

In the Academy Smith's classical dictionaries

Biography & mythologyCaiusCaius. 4. A presbyter of the church of Rome, who lived about A. D. 310. He was at a later time elected bishop of the gentiles, which probably means, t…

Quick answers

What does Caius mean in Latin?
Caius, a proper noun, means “a surname from English — famously held by”.
What is the genitive of Caius?
The genitive singular is Caiī. Caius is masculine, second declension.
How do you pronounce Caius?
In classical Latin, [ˈkaj.jʊs]; in ecclesiastical (church) Latin, [ˈkaː.jus].