LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Popilius

Popilius m sg (genitive Popiliī or Popilī)
Classical[pɔˈpɪ.li.ʊs]Ecclesiastical[poˈpiː.li.us]

Meaning

  1. masculinesingularMarcus Popilius Laenas, a Roman consul
  2. masculinesingularMarcus Popilius Laenas, a different Roman consul with the same name

Declension

declension
formsingularplural
nominativePopilius—
genitivePopiliī
Popilī
—
dativePopiliō—
accusativePopilium—
ablativePopiliō—
vocativePopilī—

Popĭlĭus (Popill-), i, m., and Popi-lĭa (Popill-), ae, f.,
I. the name of a Roman gens. So esp.,
1. M. Popillius Laenas, a consul A. U.C. 395, Cic. Brut. 14, 56.—
2. C. Popilius Laenas, the assassin of Cicero, Liv. Epit. 120; Sen. Suas. 7.—
3. In fem.: Popilia, the wife of Q. Catulus, Cic. de Or. 2, 11, 44.— Hence,
II. Popĭlĭus, a, um, adj., of or belonging to a Popilius, Popilian: gens, Cic. Leg. 2, 22, 55.

Quick answers

What does Popilius mean in Latin?
Popilius, a proper noun, means “Marcus Popilius Laenas, a Roman consul; Marcus Popilius Laenas, a different Roman consul with the same name”.
What is the genitive of Popilius?
The genitive singular is Popiliī. Popilius is masculine, second declension.
How do you pronounce Popilius?
In classical Latin, [pɔˈpɪ.li.ʊs]; in ecclesiastical (church) Latin, [poˈpiː.li.us].