-eius

• (Classical) IPA^(key): /ˈeː.i.us/, [ˈeː.i.ʊs]

By analogy with nomina gentilicia either of Oscan origin such as Pompēius (from 𐌐𐌖𐌌𐌐𐌄 (pumpe, “five”)) or of Etruscan origin such as perhaps Tarpēius or Tarpēia.[1]

• -ulēius (extended)

-ēius m (feminine -ēia, neuter -ēium); first/second declension

1. forms nomina gentilicia

   ‎Elatus + ‎-ēius → ‎Elatēius

   ‎Proculus + ‎-ēius → ‎Proculēius

• This suffix was also used to form humorous words such as stertēia (“one who snores”) from stertō (“snore”) by Petronius and stercēia (“a maidservant who cleans the excrement of children”) from stercus (“dung, manure”) by Tertullian.

First/second declension.

• -ulēius

Derived adjectives from nouns and names with an -ē̆ stem with the suffix -ius (such as plēbēius (“of the common people”) from plēbēs (“the common people”), an archaic form of plēbs).

-ēius m (feminine -ēia, neuter -ēium); first/second declension

1. forms adjectives from nouns and proper names

   ‎hordeum + ‎-ēius → ‎hordēius

   ‎Tiberius + ‎-ēius → ‎Tiberēius

First/second declension.

From Ancient Greek adjectives in -ήϊος (-ḗïos) (Epic form of Attic -έϊος (-éïos)).

-ēius m (feminine -ēia, neuter -ēium); first/second declension

1. Forms adjectives from Ancient Greek in -ήϊος (-ḗïos)

   Φῠλλήϊος (Phullḗïos) → Phyllēius

   Πρῐᾱπήϊος (Priāpḗïos) → Priāpēius

First/second declension.