Quick answer
Demetrius is a boy name with Latinized roots meaning "Demeter".
Meaning and history
Latinized form of the Greek name Δημήτριος (Demetrios), which was derived from the name of the Greek goddess Demeter 1. Kings of Macedon and the Seleucid kingdom have had this name. This was also the name of several early saints including Demetrius of Thessalonica, a martyr of the 4th century who is regarded as a warrior.
Notes and context
Usage: ancient greek | Ancient Greek: Δημήτριος