A variant of Demetrius, from Greek meaning devoted to Demeter.
Demetirus is a variant of Demetrius, the Greek name meaning devoted to Demeter, the goddess of agriculture. That root gives the name a classical and mythological foundation, linking it to fertility, earth, and the cycles of cultivation.
The altered spelling makes the name feel less traditional, but the core meaning remains rooted in ancient religion and Greek history. In modern use, Demetirus feels formal, unusual, and strongly shaped by its classical ancestry. It has the dignity of a mythological name, but the unusual ending gives it a more individualized, modern profile.
Names like this often preserve the grandeur of the original while softening or shifting the final shape. Demetirus does exactly that, keeping the classical resonance while creating a rare and distinctive sound.