LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Fannius

Fannius m sg (genitive Fanniī or Fannī)
Classical[ˈfan.ni.ʊs]Ecclesiastical[ˈfan.ni.us]

Meaning

  1. masculinesingulara Roman nomen gentile, gens or "family name" famously held by
  2. masculinesingularGaius Fannius, a Roman consul

Declension

declension
formsingularplural
nominativeFannius—
genitiveFanniī
Fannī
—
dativeFanniō—
accusativeFannium—
ablativeFanniō—
vocativeFannī—

Fannĭus, a,
I. the name of a Roman gens: 1. C. Fannius Strabo, son-in-law of Laelius, introduced as a speaker by Cicero in de Rep. and Lael.; 2. His son of the same name, who was consul A. U.C. 632, Cic. Brut. 26, 99 sq.; id. de Or. 3, 47, 183; 3. C. Fannius, an historian, contemporary with Pliny the younger, Plin. Ep. 5, 5, 1 sq.—
II. Derivv.
A. Fannĭus, a, um, adj., of or belonging to Fannius, Fannian: lex, a sumptuary law introduced by the consul C. Fannius, Gell. 2, 24; Macr. S. 2, 13.—
B. Fannĭānus, a, um, adj., the same: conturbat me epitome Bruti Fanniana, Cic. Att. 12, 5, 3 Orell. N. cr.: charta, manufactured in the establishment of Q. Rhemnius Fannius, Plin. 13, 12, 24, §§ 75, 78.

Origins

Unknown, but possibly connected to fānor, fānum (“shrine, temple, sanctuary, place dedicated to a deity”). Chase (1897) connects it to Fadus, Fadia, Fadonia, Fadiena.

In the Academy Smith's classical dictionaries

Quick answers

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