Why did Yu name his son Qi?

Legend has it that the flood crossed the river. In order to make people live and work in peace and contentment, Dayu managed water and traveled all over Kyushu. Everyone knows that Dayu didn't enter the house for three years. Once he didn't have time to go home, so he asked his wife to bring him food. Tu Shi went to deliver his meal. Although bitter, it is sweet. Dayu moved the Jade Emperor by controlling water, so he turned him into a black bear to help him cut stones. But his wife doesn't know that he is a bear during the day. One day Tu delivered a meal and found that her husband was a black bear. There was no news when she got home. Dayu hurried home, but he couldn't find the butcher stone, only himself. At this time, Dayu regretted not telling his wife about turning himself into a bear. He thought again: My wife has been pregnant for a long time, but what about my son? When I met him, I shouted at the stone, son of a bitch, did you just leave me? You must give me your son! Suddenly, with a loud noise, the big stone cracked. His son jumped out from where the boulder broke. Dayu hurriedly picked up his son affectionately. Later, when the child grew up, Dayu named him Qi. This is a legend, but there is really a Mukai stone in Anhui! (Legend has it that she married Tu Shanshi's daughter, left home for water control four days after marriage, and did not return for thirteen years; Tu Shanshi woman leads Nan tiao every day, expecting her husband to come back. However, looking through the autumn water, I can't see Yugui. Because I miss you so much, I finally turned to stone and sat in the place where I had a tryst with Yu. )