The name Dēmētrios is a Greek name meaning 'belonging to Demeter' (the Greek goddess of harvest). Two men named Demetrius appear in the New Testament: a silversmith in Ephesus who instigated a riot against Paul, and a disciple commended by John.
The contrast between the two Demetriuses in the New Testament is striking. Demetrius the silversmith (Acts 19) represents worldly religion protecting economic interests — his riot against Paul was motivated by lost income from idol-making, not genuine theological concern. Demetrius commended by John (3 John 1:12) represents the opposite: a man with a good testimony from everyone, including 'the truth itself.' These two men illustrate that the same name can belong to someone driven by earthly gain or heavenly commendation.