Pompeius

Latin

Borrowed from Oscan [Term?], from 𐌐𐌖𐌌𐌐𐌄 (pumpe, “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.^[1]^[2] See also Pompeiī. Doublet of Quinquius, the native Latin form.

(Classical Latin) IPA^(key): /pomˈpei̯.i̯us/, [pɔmˈpɛi̯ːʊs̠]
(modern Italianate Ecclesiastical) IPA^(key): /pomˈpe.jus/, [pomˈpɛːjus]
Note: the spelling ei in this word most likely stood for a short vowel followed by the geminate consonant /i̯/.

Pompeius (feminine Pompeia, neuter Pompeium); first/second-declension adjective

	masculine	feminine	neuter	masculine	feminine	neuter
	singular			plural
nominative	Pompeius	Pompeia	Pompeium	Pompeiī	Pompeiae	Pompeia
genitive	Pompeiī	Pompeiae	Pompeiī	Pompeiōrum	Pompeiārum	Pompeiōrum
dative	Pompeiō	Pompeiae	Pompeiō	Pompeiīs
accusative	Pompeium	Pompeiam	Pompeium	Pompeiōs	Pompeiās	Pompeia
ablative	Pompeiō	Pompeiā	Pompeiō	Pompeiīs
vocative	Pompeie	Pompeia	Pompeium	Pompeiī	Pompeiae	Pompeia

Pompeius m (genitive Pompeiī or Pompeī, feminine Pompeia); second declension

	masculine	feminine	masculine	feminine
	singular		plural
nominative	Pompeius	Pompeia	Pompeiī	Pompeiae
genitive	Pompeiī	Pompeiae	Pompeiōrum	Pompeiārum
dative	Pompeiō	Pompeiae	Pompeiīs	Pompeiīs
accusative	Pompeium	Pompeiam	Pompeiōs	Pompeiās
ablative	Pompeiō	Pompeiā	Pompeiīs	Pompeiīs
vocative	Pompeie	Pompeia	Pompeiī	Pompeiae

Pompeius m sg (genitive Pompeiī or Pompeī); second declension

The vocative of given names with this suffix has one syllable less than the genitive.^[3]

Second-declension noun, singular only.

¹Found in older Latin (until the Augustan Age).

^ Leumann, Manu, Hofmann, Johann Baptist, Szantyr, Anton (1977) “138, 1a”, in Lateinische Grammatik: Lateinische Laut- und Formenlehre, CH Beck, page 127
^ Leumann, Manu, Hofmann, Johann Baptist, Szantyr, Anton (1977) “273, 1d”, in Lateinische Grammatik: Lateinische Laut- und Formenlehre, CH Beck, page 289
^ Leumann, Manu, Hofmann, Johann Baptist, Szantyr, Anton (1977) “325, 2: Vokativ”, in Lateinische Grammatik: Lateinische Laut- und Formenlehre, CH Beck, page 424