LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Vennōnius

Vennōnius m sg (genitive Vennōniī or Vennōnī)
Classical[wɛnˈnoː.ni.ʊs]Ecclesiastical[venˈnɔː.ni.us]

Meaning

  1. a Roman nomen gentile, gens or "family name" famously held by
  2. Vennonius, a Roman historian mentioned by Cicero, whose work is lost

Declension

declension
formsingularplural
nominativeVennōnius—
genitiveVennōniī
Vennōnī
—
dativeVennōniō—
accusativeVennōnium—
ablativeVennōniō—
vocativeVennōnī—

Vennōnĭus, ĭi, m.,
I. a Roman historian whose works are lost, Cic. Att. 12, 391; id. Leg. 1, 2, 6.

Origins

Possibly from Vennō + -ius.

In the Academy Smith's classical dictionaries

Quick answers

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