"Variant of Demetrius"
The name Demetrus is commonly a male name from the "Greek" origin.
Demetrus is a variant spelling of Demetrius, the English form of Greek Demetrios, a name formed from the name of the goddess Demeter. The ending -us in place of -ius is a recurring spelling pattern in American records. The name is not a separate tradition of its own; it carries the same derivation as Demetrius.
Demetrius means "Covering of earth, Of Demeter, goddes of fertility. The masculine form of Demetria.".
The pronunciation of Demetrus is deh-MEE-trus.