Posie (also spelled Posy) comes from the English word posy, originally a short verse or motto, then a small bouquet of flowers carried as a fragrant token. The word ultimately derives from poesy (poetry).
Posie has been rising in the United Kingdom as a contemporary girls' name. In the U.S. it entered the top 1000 in 2023.
Posie 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 Posie reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.