Is calligrapher Wang Yun a descendant of Wang Xizhi?

That's not true. According to the inquiry website, Wang Yun is the 52nd generation descendant of Wang Xizhi, a book sage. Wang Yun was born in huangping county, Guizhou. In the 26th year of Emperor Kangxi of Qing Dynasty (A.D. 1687), he served as Professor Shi Qianfu. Thirty-six years (AD 1697) Jinshi. In forty-one years (A.D. 1702), he was appointed as the magistrate of Jiading County in the south of the Yangtze River, and served as the examiner after the last two examinations in China. In the second year of Yongzheng (AD 1724), he retired to his hometown.