Cui (翠) means "jade-green" — also the kingfisher bird whose feathers were prized in imperial jewelry.
Cui is widely used in China.
Cui 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 Cui reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.