-eius¹

Meaning

1. morphemesuffixforms nomina gentilicia
   Elatus → Elateius
   Proculus → Proculeius

Origins

By analogy with nomina gentilicia of Oscan or perhaps Etruscan origin, such as Pompeius (from *pompe (“five”)), Tarpeius, Saufeius. Difficult to distinguish from Etymology 2. Gentilics ending in -eius may have originated from a Faliscan variant of this suffix, whereas -aius (as in Anaius, Popaius, Ulaius) may go back to Oscan, and -aeus (as in Annaeus) to Paelignian and Umbrian.

Meaning

1. morphemesuffixforms adjectives from nouns and proper names
   pāgus + -ēius → pāgēius

Origins

Latin -ēius Derived adjectives from nouns and names with an -ē stem with the suffix -ius (such as plēbēius (“of the common people”) from plēbēs (“the common people”), an archaic form of plēbs). Difficult to distinguish from Etymology 1.

Meaning

1. literarymorphemepoeticsuffixForms adjectives, chiefly from Ancient Greek nouns, but occasionally from native ones as well
   Ancient Greek φῠ́λλος (phŭ́llos, “leaf”) → Phyllēïus (corresponding to Φῠλλήϊος (Phŭllḗïos))
   Ancient Greek Πρῐ́ᾱπος (Prĭ́āpos) → Priāpēïus (corresponding to Πρῐᾱπήϊος (Prĭāpḗïos))

Origins

From Ancient Greek adjectives in -ήϊος (-ḗïos), Epic form of Attic -εῖος (-eîos). Perhaps more properly considered a poetically variant scansion of the suffixes under Etymology 1 and 2, modelled on the corresponding situation in Greek.