Demetria is the feminine of Demetrius — from the Greek Dēmḗtēr (the goddess of grain, harvest, and the cycle of life and death). Demetria Devonne Lovato (born 1992) — birth name of Demi Lovato, the American singer-songwriter and actress; six-time Grammy nominee; Disney's Camp Rock (2008, 2010); discography includes the Billboard 200 #1 albums Confident (2015) and Tell Me You Love Me (2017); has been outspoken about mental health, substance abuse recovery, and identity. Demetria Hopkins — American actress. Demetria of Bithynia — Byzantine empress. The name's namesake goddess Demeter is one of the Twelve Olympians and the central figure of the Eleusinian Mysteries — the most-celebrated mystery religion of the ancient Greco-Roman world.
Demetria does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Demetria reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.