Quỳnh is the Vietnamese word for the rare night-blooming cereus flower — which opens only one night per year. In Vietnamese poetry, Quỳnh symbolizes fleeting beauty.
Quynh is widely used in Vietnam.
Quynh 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 Quynh reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.