Answer
Yunchang was the courtesy name of Guan Yu, a renowned general in the Three Kingdoms period of China. Courtesy names, also known as zi, were used in ancient China to show respect and familiarity. They were often chosen to reflect a person's character or aspirations. In Guan Yu's case, "Yunchang" translates to "Cloud Long," possibly alluding to his towering stature and unwavering loyalty.