Lan (蘭) is the Vietnamese and Chinese word for "orchid" — the flower most associated with refined elegance in East Asian poetry.
Lan is widely used across Vietnam and China.
Lan 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 Lan reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.