LATIN DICTIONARYLexicon Latīnum
noun · masculinesecond declension

Pompeius1

Pompeius m (genitive Pompeiī or Pompeī, feminine Pompeia)
Classical[pɔmˈpɛj.jʊs]Ecclesiastical[pomˈpɛː.jus]

Meaning

  1. masculinea citizen of Pompeii, a Pompeian

Declension

declension
formsingularplural
nominativePompeius
Pompeia
Pompeiī
Pompeiae
genitivePompeiī
Pompeiae
Pompeiōrum
Pompeiārum
dativePompeiō
Pompeiae
Pompeiīs
accusativePompeium
Pompeiam
Pompeiōs
Pompeiās
ablativePompeiō
Pompeiā
Pompeiīs
vocativePompeie
Pompeia
Pompeiī
Pompeiae

Pompējus (trisyl.) or Pompēïus (quadrisyl.), i, m., and Pompēja, ae, f.,
I. name of a Roman gens. So the famous Cn. Pompejus Magnus, the triumvir, Caes. B. C. 3, 86; Cic. Fam. 3, 4, 2; 13, 41, 1; id. Imp. Pomp. 1 sqq. et saep.—In fem., Pompeja, his sister, Cic. Fam. 5, 11, 2; another, his daughter, Hirt. B. Afr. 95, 3; a third, daughter of Q. Pompeius, wife of Julius Cœsar, divorced from him, Suet. Caes. 6; 74.— Hence,
A. Pompējus (Pompēïus), a, um, adj., of or belonging to a Pompey, Pompeian: domus, Ov. P. 4, 5, 9: lex, Caes. B. C. 3, 1: porticus, at Rome, Prop. 2, 23, 45 (3, 30, 11); cf. Plin. 35, 9, 35, § 59; Suet. Caes. 81: via, leading through Sicily, Cic. Verr. 2, 5, 66, § 169: ficus, Plin. 15, 18, 19, § 70.—
B. Pompējānus, a, um, adj., of Pompey, Pompeian: equitatus, Caes. B. C. 3, 58: classis, id. ib. 3, 101: triumphi, Luc. 3, 166: caedes, id. 10, 350: porticus (usually called Pompeja porticus), Vitr. 5, 9: theatrum, Mart. 6, 9; 14, 29; hence also, Notus, which blew in Pompey's theatre, id. 11, 21: ficus (also called Pompeja ficus), Cloat. ap. Macr. S. 2, 16: partes, Sen. Ep. 71, 9.—
2. Subst.: Pompējāni, ōrum, m., the adherents or soldiers of Pompey, Pompey's party, Pompey's troops, Caes. B. C. 3, 46; Vell. 2, 52, 4; Sen. Ira, 3, 30, 5.—In sing., Tac. A. 4, 34: Pompejanus Cilix, Luc. 4, 448.

Origins

Borrowed from Oscan, from *pompe (“five”) + -eius, from Proto-Italic *kʷenkʷe, from Proto-Indo-European *pénkʷe. Compare Oscan 𐌐𐌞𐌌𐌐𐌀𐌉𐌉𐌀𐌍𐌔 (púmpaiians, “Pompeian”, masc.nom.sg.), which shows that the penultimate vowel was short, as well as the geminate consonant, just as in peius. See also Pompeiī. Doublet of Quinquius, the native Latin form.

In the Academy Smith's classical dictionaries

adjectivefirst/second-declension adjective
Pompeius2
Pompeius (feminine Pompeia, neuter Pompeium)
Classical[pɔmˈpɛj.jʊs]Ecclesiastical[pomˈpɛː.jus]

Meaning

  1. adjectiveof or relating to Pompeii, Pompeian

Declension

singular
formmasculinefeminineneuter
nominativePompeiusPompeiaPompeium
genitivePompeiīPompeiaePompeiī
dativePompeiōPompeiaePompeiō
accusativePompeiumPompeiamPompeium
ablativePompeiōPompeiāPompeiō
vocativePompeiePompeiaPompeium
plural
formmasculinefeminineneuter
nominativePompeiīPompeiaePompeia
genitivePompeiōrumPompeiārumPompeiōrum
dativePompeiīsPompeiīsPompeiīs
accusativePompeiōsPompeiāsPompeia
ablativePompeiīsPompeiīsPompeiīs
vocativePompeiīPompeiaePompeia

Origins

Borrowed from Oscan, from *pompe (“five”) + -eius, from Proto-Italic *kʷenkʷe, from Proto-Indo-European *pénkʷe. Compare Oscan 𐌐𐌞𐌌𐌐𐌀𐌉𐌉𐌀𐌍𐌔 (púmpaiians, “Pompeian”, masc.nom.sg.), which shows that the penultimate vowel was short, as well as the geminate consonant, just as in peius. See also Pompeiī. Doublet of Quinquius, the native Latin form.

In the Academy Smith's classical dictionaries

proper noun · masculinesecond declension
Pompeius3
Pompeius m sg (genitive Pompeiī or Pompeī)
Classical[pɔmˈpɛj.jʊs]Ecclesiastical[pomˈpɛː.jus]

Meaning

  1. masculinesingularA Roman nomen gentilicium, gens or "family name" famously held by
  2. masculinesingularGnaeus Pompeius Magnus or Pompey the Great

Declension

declension
formsingularplural
nominativePompeius—
genitivePompeiī
Pompeī
—
dativePompeiō—
accusativePompeium—
ablativePompeiō—
vocativePompei—

Origins

Borrowed from Oscan, from *pompe (“five”) + -eius, from Proto-Italic *kʷenkʷe, from Proto-Indo-European *pénkʷe. Compare Oscan 𐌐𐌞𐌌𐌐𐌀𐌉𐌉𐌀𐌍𐌔 (púmpaiians, “Pompeian”, masc.nom.sg.), which shows that the penultimate vowel was short, as well as the geminate consonant, just as in peius. See also Pompeiī. Doublet of Quinquius, the native Latin form.

In the Academy Smith's classical dictionaries

Quick answers

What does Pompeius mean in Latin?
Pompeius, a noun, means “a citizen of Pompeii, a Pompeian”.
What is the genitive of Pompeius?
The genitive singular is Pompeiī. Pompeius is masculine, second declension.
How do you pronounce Pompeius?
In classical Latin, [pɔmˈpɛj.jʊs]; in ecclesiastical (church) Latin, [pomˈpɛː.jus].