Melaina is from the Greek Melaina (Μέλαινα) — feminine of melas (black, dark). Demeter Melaina (Black Demeter) is the Arcadian epithet of the goddess Demeter — worshipped at the Cave of Phigalia in Arcadia (Peloponnese, Greece) where she was depicted as a black-mantled horse-headed deity holding a dolphin + a dove. 174 CE) — the ancient travel guide.
Melaina 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 Melaina reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.