Dimitrios is a male name in Greece; it is one of the most common Greek names, quite popular in Northern Greece and mostly in Thessaloniki and nearby areas. Dimitrios is a name deriving from the female name Demeter (associated with Goddess Demeter in the ancient years), referring to the one born from the earth.
Female Version of Name Dimitrios: Dimitra
Nameday of Name Dimitrios: October 26th
Origin of Name Dimitrios – Agios Dimitrios, Saint Demetrius
Although the name Dimitrios refers to an ancient Greek word, the Christian name Dimitrios is given to men today as an honor to Agios Dimitrios, or Saint Demetrius, a Christian martyr that lived in the early 4th century AD.
You can read additional details about name Dimitrios and its origin at the pertinent post for name Dimitris.