Yuhuan (玉環) means "jade ring" in Chinese. Yang Yuhuan, known as Yang Guifei (719-756), was the most famous beauty in Chinese history — favorite consort of Emperor Xuanzong of Tang.
One of the Four Beauties of ancient China.
Yuhuan 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.
In Pythagorean numerology the letters of Yuhuan reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.