I have a Vietnamese immigrant friend named Ruan, who said that his ancestors were Ruan in the Water Margin, and Ruan went to Vietnam?

Ruan, nicknamed "Live" Liangshan Hero No.31Ren, the sixth leader of eight members of Liangshan Water Army. Ruan, the youngest of Ruan's three masters, walked the rivers and lakes with his two brothers and did many earth-shattering things. Huang Nigang and Chao Gai drugged Yang Zhi, a green-faced beast, and robbed the birth class. Xunyang River saved Sung River and defeated the loyalist. By boat in water margin, He Tao was defeated first, and then Gao Qiu was defeated. Kung fu in water makes Liangshan heroes sit up and take notice. He and Meng Tong are stationed in Shuicun, northwest of Liangshanpo. Ruan was recruited as an envoy of Gai Tianjun, and was dismissed as a civilian because he was playing in a dragon robe. Ruan and his old mother went back to fishing in the Water Margin and died at the age of 60.