Illius as a Baby Name. Meaning and Origin of Illius

What is the meaning of the name Illius ?

The baby name Illius is a Male name , 3 syllables long and is pronounced ILL-ee-us (ˈɪliəs),ih-LEE-us (ɪˈliːəs) — less common.

Illius is in Origin.

Illius is a rare masculine given name shaped by Latin and liturgical traditions, likely arising where the Latin Iulius/Julius and Greek–Latin Elijah forms (Elias/Ilias) overlapped in medieval and early‑modern records. Scribal variation of I/J and -li-/-lli- spellings occasionally yielded Illius, and similar shapes appear in Eastern Europe: Romanian Iliuș (a diminutive of Ilie), Lithuanian Ilijus, and South Slavic Ilija. As a modern given name, it remains very uncommon but feels at home in classical and ecclesiastical contexts.

If traced to the Elijah/Elias line, Illius carries the Hebrew meaning “Yahweh is my God.” If linked to Julius, it inherits the Roman family name’s debated sense: “descended from Iulus” (Aeneas’s son) or “downy‑bearded; youthful” from Greek ioulos. Close variants and cognates include Elias, Elijah, Élie, Ilyas, Ilija, Ilie, Ilijus, plus Julius, Iulius, Julio, Jules, Giulio, and Július. The form Illius offers an antique twist with pan‑European ties.

⚙ Illius is an extremely rare name. Across our dataset of national birth registries and international name records, Illius appears only 2 times in total — found in 1 country. If you're considering it, you'd be giving your child a name almost nobody else has.