Meiyu is from the Chinese 美玉 (Měiyù — měi beautiful + yù jade — beautiful jade). Meiyu is one of the Chinese feminine names — central to traditional Chinese Confucian + Daoist heritage. 4700-2900 BCE + Liangzhu Culture jade c. Chinese feminine name reflecting Chinese jade-virtue heritage.
Meiyu 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 Meiyu reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.