Poe means a pearl — the luminous treasure of the Pacific lagoons. It carries beauty and quiet worth.
Poe 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 Poe reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.