@Joe Nation,
Yuan in Chinese literally means a "round object" or "round coin". During the Qing Dynasty, the yuan was a round and silver coin.
The character for yuan has two forms—a less formal, 元, and a more formal, 圓 or 圆. The pronunciation of the two in Mandarin Chinese is the same—yuán. However, in Wu Chinese, as inherited from traditional Chinese pronunciation, 元 (nyoe) and 圓 (yoe) remain distinct phonetically. The Japanese yen was originally also written 圓, which was simplified to 円 (en) with the promulgation of the Tōyō kanji in 1946. The Korean won used to be written 圓 (won) some time after World War II and as 圜 from 1902 to 1910, but is now written as 원 (won) in Hangul exclusively, in both North and South Korea. The Hong Kong dollar, Macanese pataca and New Taiwan dollar are all written as 圓. In People's Republic of China, using '¥' as well as RMB to denote the currency is common (e.g. ¥100元 or RMB 100元).