Demeter (Δημήτηρ) is the Greek goddess of the harvest, agriculture, and motherly love. The name is composed of dē (possibly an early form of "earth") and mētēr (mother) — meaning "earth mother." Her daughter Persephone's abduction by Hades caused Demeter to bring winter to the earth.
Demeter is rare as a given name but rising — chosen by parents who want classical mythological weight.
Demeter 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 Demeter reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.