LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Messius

Messius m sg (genitive Messiī or Messī)
Classical[ˈmɛs.si.ʊs]Ecclesiastical[ˈmɛs.si.us]

Meaning

  1. masculinesingulara Roman nomen gentile, gens or "family name" famously held by
  2. masculinesingularArusianus Messius, a Roman grammarian

Declension

declension
formsingularplural
nominativeMessius—
genitiveMessiī
Messī		—
dativeMessiō—
accusativeMessium—
ablativeMessiō—
vocativeMessī—

Quick answers

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