LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Herennius

Herennius m sg (genitive Herenniī or Herennī)
Classical[hɛˈrɛn.ni.ʊs]Ecclesiastical[eˈrɛn.ni.us]

Meaning

  1. masculinesingulara Roman nomen gentile, gens or "family name" famously held by
  2. masculinesingularHerennius Senecio, a Roman writer

Declension

declension
formsingularplural
nominativeHerennius—
genitiveHerenniī
Herennī
—
dativeHerenniō—
accusativeHerennium—
ablativeHerenniō—
vocativeHerennī—

Hērennĭus, a,
I. the name of a Roman gens, e. g. C. Herennius, to whom the Rhetorica of Cornificius is dedicated: M. Herennius, an orator, Cic. Brut. 45, 166; id. Mur. 17, 36: Herennius Gallus, Tac. H. 4, 13; 19; 26 sq.: Herennius Senecio, a historian under Domitian, id. Agr. 2; 45; a Samnite Herennius, Liv. 9, 1; Flor. 1, 16, 10.—
II. Deriv.: Hērennĭānus, a, um, adj., of or belonging to a Herennius, Herennian: coheredes, Cic. Att. 13, 6, 2.

Origins

From an Oscan personal name, probably related to 𐌇𐌄𐌓𐌉𐌉𐌀𐌃 (heriiad, “he wants”) (compare Umbrian 𐌇𐌄𐌓𐌉 (heri)), from Proto-Italic *herjō (“to wish, want”). Probably influenced by Etruscan.

In the Academy Smith's classical dictionaries

Quick answers

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