King Wen of Zhou
The surname of Guō descended from Prince Guo Shu (虢叔), the 3rd son of King Ji of Zhou. The character guó (虢, /*kʷraːɡ/) is rare in Chinese, and means "to hunt and flay a tiger", indicating that Guo Shu was a brave warrior. During the war unifying China, King Wen of Zhou always consulted his two younger brothers Guo Zhong (half brother) and Guo Shu (full brother).