Why did Peng, Dong and Li Wei choose "Longxi" as the county name and hall number?

Peng, Dong and Li belong to the same clan, and the other six surnames (Shi, Min, Niu, Xin, Guan and Bian) all originated in Longxi, Gansu, China, with a long history. The name of Longxi, called Longxi County in ancient times, is now a county in Gansu Province, China, west of Longshan, on the banks of Weishui River, the largest tributary of the Yellow River, and the cradle of the Chinese nation. Longxi is the county seat of Peng, Dong and Li, and it is also one of their hall names. Because Peng, Dong and Li have the same distant ancestor in China, they are related by blood. So traditionally, people with three surnames are brothers and sisters and are not allowed to marry each other. They posted the word "Dragon Jubilee" at home and in the hall to show recognition, enhance feelings and strengthen contact and cooperation. According to the genealogy of the three prominent families in Longxi (Peng, Dong and Li), Peng's surname, Dong's surname and Li's surname are all from "Gao Xin Gong" in the middle of Shandong Province. There is the following record in the music score: "The official to the fifth ancestor is named, but he is afraid of the public in the middle of Shandong. Six sons of boys, Chang Kunwu. Sanqiankeng, Keng, Sihui, Wu 'an and Liulian. " There is another cloud: (1) I am afraid of the great cause of Kunwu, and my son is afraid of the great cause of Hao Tao. I am an official and have made meritorious service. Emperor Shun cited his family's official career as an excuse. (Ancient prose and Li Tong) Therefore, later generations regard Li Chuan as the ancestor. (2) Avoid participation in Hu, and give birth to Guo Shuan, and Guo Shuan gives birth to Dong Fu. Shi Yu, who is good at treating dragons, has made great contributions. Emperor Shun took the butler as Dong Shi, and Lu Zhonggong's great-grandson was named Dong, and later he was the ancestor. (3) taboo Qian Keng male, sealing color city in Han Dapeng site, summer sealing "Xia Bo" with official life family as Peng, so called Peng Zu, the ancestor of Peng also. (4) people who are afraid of meeting people, followed by Wuyang, that is, Yi Yan in the Warring States period. Now there is the ancient city of Wuyang in the southeast of Yixian County, Hebei Province. (5) taboo, qiaocheng country is also late, in the spring and autumn period, Chen qiaocheng, Qin qiaocheng, now hao county. (6) It's too late to be married in season. From the above records, we can explain the kinship of Peng, Dong and Li. People from all over the country, such as Peng, Dong and Li, originally from Longxi, Gansu, China, thought that the name of the hall was Longxitang, and organized a community called Longxitang or Longxihui. In Malaysia, there are six associations of the same nature, namely Sarawak Dragon Jubilee Association, Shiwu Dragon Jubilee Association, Dashanjiao Dragon Jubilee Club, Gibbon Dragon Jubilee Club, Beihai Dragon Jubilee Club and Weinan/Geelong Dragon Jubilee Club. These six groups have close relations, profound friendship and frequent exchanges.