Descendents of Ben Tao were rewarded the Ruan kingdom. Another origin of Ruan came from the Shi (stone, rock) family who changed their name to Ruan. In Vietnamese, the surname Ruan is known as Nguyen, which is the most popular family name. Nguyen is clearly a Chinese name. Many Vietnamese with this surname claim their ancestor to be a man called Ruan Cho, who was a governor of N. VN during the Chen Dynasty (Ruan means a musical instrument)