The origin of the surname "Qu"

According to the older generation, Qujia's ancestral home is Dengzhou, Shandong Province, probably in Yantai and Penglai areas of Jiaodong Peninsula opposite Bohai Sea. Legend has it that they immigrated in Shunzhi for eight years, one stayed and the other went abroad. There is no evidence to test this history, but there are many Shandong people in the northeast, so everyone says so. Qu surname is a lonely surname. Strangely, it does not exist in the hundred surnames, nor does it exist in the extended hundred surnames. No one can tell the origin of the Qu family. Once, a street fortune teller said that he could tell the origin of various surnames. I asked him to tell me the origin of Qu's surname, but he rolled his eyes for a long time and couldn't say it. The more I have no source, the more I want to understand, so I ask for advice everywhere. One year, the company held a technical exchange meeting, and a general manager of Tianjin Petrochemical Company was also named Qu. He told a joke: there was no Qu surname, and it is said that it evolved from the "Ju" surname. How many years ago, the surname "Ju" was powerful and the official residence was second to none. I don't know why I committed the crime of copying with the door. I will inform all the city gates to see the surname "Ju" and kill them without asking indiscriminately. When someone fled overnight and came to the gate to enter the customs, the guarding city warrior asked them what they were doing. Last name? In desperation, I blurted out: "surname ju"! Shandong people speak irregularly and don't distinguish between "four" and "ten". The misunderstanding of guarding the city is "surname Qu", so I opened the door and let people go. Therefore, this part of the surname "Ju" escaped a bullet, and his surname changed from Ju to Qu, which continues to this day. This song always tells the truth after drinking. I don't know which history book it comes from. They are all legends to solve the mystery of the origin of surnames.