Xiulan is from the Chinese 秀兰 (Xiùlán — xiù elegant/refined + lán orchid — elegant orchid, refined lily-orchid). Xiulan is one of the Chinese feminine names — central to traditional Chinese Confucian heritage. Chinese feminine name.
Xiulan 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 Xiulan reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.