Maisie is the Scottish diminutive of Margaret — from the Greek margaron, meaning "pearl." The name was popularised by James M.
Maisie has been climbing in popularity in the United Kingdom, where it sits in the top 50. Today in the U.S. Maisie sits in the top 600 and is rising fast.
Maisie 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 Maisie reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.