"Variant of Demetrius"
The name Demetrious is commonly a male name from the "Greek" origin.
Demetrious is a spelling variant of Demetrius, the Latin form of the Greek name Demetrios. Demetrios is formed from Demeter, the Greek goddess of agriculture, whose name appears throughout Greek literature and cult practice. The added o in Demetrious changes the spelling but not the derivation.
Demetrius means "Covering of earth, Of Demeter, goddes of fertility. The masculine form of Demetria.".
The pronunciation of Demetrious is dih-MEE-tree-us.