LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Gāvius

Gāvius m sg (genitive Gāviī or Gāvī)
Classical[ˈɡaː.wi.ʊs]Ecclesiastical[ˈɡaː.vi.us]

Meaning

  1. a Roman nomen gentile, gens or "family name" famously held by
  2. Marcus Gavius Apicius, a Roman cookbook writer

Declension

declension
formsingularplural
nominativeGāvius—
genitiveGāviī
Gāvī
—
dativeGāviō—
accusativeGāvium—
ablativeGāviō—
vocativeGāvī—

Gāvĭus, a,
I. name of a Roman gens. So L. Gavius, who was crucified by Verres, Cic. Verr. 2, 5, 61 sq.—Hence, Gāvĭānus, a, um, adj., of Gavius: crux, Lact. 4, 18.

Origins

Said to have two origins, one being a Latin variant of Gaius, the other being used by tribes of Oscan and Sabine origin, such as Gavius Pontius.

In the Academy Smith's classical dictionaries

Quick answers

What does Gāvius mean in Latin?
Gāvius, a proper noun, means “a Roman nomen gentile, gens or "family name" famously held by”.
What is the genitive of Gāvius?
The genitive singular is Gāviī. Gāvius is masculine, second declension.
How do you pronounce Gāvius?
In classical Latin, [ˈɡaː.wi.ʊs]; in ecclesiastical (church) Latin, [ˈɡaː.vi.us].