Dimitra (Δήμητρα) is the modern Greek form of Demeter — the ancient Greek goddess of the harvest, grain, and the bounty of the earth. Mother of Persephone.
Dimitra is widely used in modern Greece.
Dimitra 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.
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In Pythagorean numerology the letters of Dimitra reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.