LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Olȳbrius

Olȳbrius m sg (genitive Olȳbriī or Olȳbrī)
Classical[ɔˈlyː.bri.ʊs]Ecclesiastical[oˈliː.bri.us]

Meaning

  1. A Roman cognomen — famously held by
  2. Olybrius, a Roman emperor

Declension

declension
formsingularplural
nominativeOlȳbrius—
genitiveOlȳbriī
Olȳbrī		—
dativeOlȳbriō—
accusativeOlȳbrium—
ablativeOlȳbriō—
vocativeOlȳbrī—

Ŏlȳbrius (Ōlўbrius, Anth. 2, p. 287), ĭi, m.,
I. the surname of several Roman consuls. To one of them, the consul Anicius Olybrius, is addressed a poem of Claudian. —Hence, Olȳbrĭăcus, a, um, adj., Olybrian: genus et nomen, Prud. ap. Symm. 1, 556.

Quick answers

What does Olȳbrius mean in Latin?
Olȳbrius, a proper noun, means “A Roman cognomen — famously held by”.
What is the genitive of Olȳbrius?
The genitive singular is Olȳbriī. Olȳbrius is masculine, second declension.
How do you pronounce Olȳbrius?
In classical Latin, [ɔˈlyː.bri.ʊs]; in ecclesiastical (church) Latin, [oˈliː.bri.us].