LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Polybius

Polybius m sg (genitive Polybiī or Polybī)
Classical[pɔˈly.bi.ʊs]Ecclesiastical[poˈliː.bi.us]

Meaning

  1. masculinesingulara male given name from Ancient Greek — famously held by
  2. masculinesingularPolybius, an Ancient Greek historian of the Hellenistic period.

Declension

declension
formsingularplural
nominativePolybius—
genitivePolybiī
Polybī
—
dativePolybiō—
accusativePolybium—
ablativePolybiō—
vocativePolybī—

Pŏlўbĭus, ii, m., = Πολύβιος,
I. a celebrated Greek historian from Megalopolis, in Arcadia, the son of Lycortas and friend of the younger Scipio Africanus, Cic. Rep. 1, 21, 34; 2, 14, 27; 4, 3, 3; id. Off. 3, 32, 113; Liv. 30, 45.

Origins

Proto-Indo-European *pleh₁-der. Proto-Indo-European *polh₁ús Ancient Greek πολῠ́ς (polŭ́s) Ancient Greek πολῠ- (polŭ-) Proto-Indo-European *gʷeyh₃-der. Ancient Greek βίος (bíos) Ancient Greek Πολύβιος (Polúbios)bor. Latin Polybius Borrowed from Ancient Greek Πολύβιος (Polúbios).

In the Academy Smith's classical dictionaries

Quick answers

What does Polybius mean in Latin?
Polybius, a proper noun, means “a male given name from Ancient Greek — famously held by”.
What is the genitive of Polybius?
The genitive singular is Polybiī. Polybius is masculine, second declension.
How do you pronounce Polybius?
In classical Latin, [pɔˈly.bi.ʊs]; in ecclesiastical (church) Latin, [poˈliː.bi.us].