The surname meng
It inherits the Ji surname, with its founding ancestors being Qingfu Gongzhong (Meng Sun) and ji 絷(gong Meng). It is the 84th surname among the top 100 surnames in contemporary China. The population of the Meng surname of the Dang family is approximately 2.9 million, accounting for about 0.24% of the total population of the country. The founding ancestors of the Meng family, who immigrated from the Great Locust Tree in Hongtong during the Ming Dynasty, were from Pingyang and Taiyuan prefectures, as well as from Ze, Lu, Liao, Fen and Qin prefectures, and Hongtong and Zhaocheng counties. In the early Ming Dynasty, the Hongtong Great Locust Tree was relocated to other places in a concentrated manner. By the end of the Qing Dynasty, its descendants were distributed in Henan, Shandong, Hebei, Beijing, Tianjin, Shaanxi, Gansu, Ningxia, Anhui, Jiangsu, Hubei, Hunan, Guangxi, Inner Mongolia, Liaoning, Jilin, Heilongjiang, Shanxi and other places. 
The earliest record of the surname Meng can be found in the "Qianfu Lun" of the Eastern Han Dynasty.
There are two sources of the surname:
① It originates from the Ji surname. According to the "Records of the Grand Historian" and the "General Chronicles: A Brief Account of Clans", in the 11th century BC, after King Wu of Zhou overthrew the Shang Dynasty, the Western Zhou Dynasty enfeoffed vassal states of the same surname. Boqin, the son of Duke Dan of Zhou, was enfeoffed in Lu and established his capital in Qufu. By the time of Duke Huan of Lu during the Spring and Autumn Period, his eldest son, Qingfu Gongzhong, born to his concubine, was the half-brother of Duke Zhuang of Lu. After Duke Zhuang of Lu died, Zi Ban ascended the throne. Qingfu murdered Zi Ban and instead enfeoffed Kai, the son of Duke Zhuang and Shu jiang, who was known as Duke 涽 of lu. Two years after the reign of Duke 涽, Qingfu murdered Duke 涽 again and attempted to establish himself. Within three years, Qingfu killed two emperors in succession, causing great chaos in the State of Lu. Therefore, there is the idiom "If Qingfu had not died, Lu's troubles would not have ended." Afterwards, in order to evade the charges, Qingfu fled to the State of Ju. At that time, Lu Jiyou, Qingfu's younger brother, was the prime minister of Lu. He used bribes to beg Ju to send him back to Lu. Ju later agreed to send him back to Lu. On his way back, Qingfu was forced to commit suicide. After Qingfu's death, Ji You allowed his son Gongsun Ao to inherit Qingfu's position. As Qingfu was the eldest in the family, he was called Mengsun according to his order of birth. So his descendants took the courtesy name Mengsun as their surname. The Mengsun family, along with the Jisun and Shusun families, controlled the politics of the State of Meng. Later, the descendants of the Mengsun family, to avoid the crime of killing their monarch, changed their surname to Meng. It's the Meng surname from Shandong.
② It originates from the Ji surname. According to the "Urgent Response to Surnames" and the "Dialectical Analysis of Surnames in Ancient and Modern Times", during the Spring and Autumn period, the eldest son of Duke Xiang, the 28th king of the State of Wei, was named 絷, with the courtesy name gongmeng. Due to illness, he was unable to have an heir. His grandson Qu took his grandfather's courtesy name as his surname, thus becoming Gongmeng. Some of his descendants took Gong Meng as their surname or Meng as their surname. It is the Meng surname from Henan. The ancestor of the Meng surname in Shandong was Duke of Zhou, and in Henan, it was Kang Shu. Both Duke of Zhou and Kang Shu were sons of King Wen of Zhou. Therefore, all Meng surnames in the world originated from the Ji surname and are essentially one family.
The main ancestral homes of the Meng surname include Luoyang, Pinglu County, Donghai Commandery, Julu Commandery, Wukang County, Anping County, Jiangxia Commandery, etc. Julu Commandery: Established in the 25th year of Qin Shi Huang (222 BC), its administrative center was located in Julu (now southwest of Pingxiang, Hebei Province). It is equivalent to the area south of Baiyangdian and Wen 'anwa in Hebei Province, west of the South Canal, east of Gaoyang, Ningjin and Renxian counties, north of Pingxiang and Weixian counties, and between Dezhou and Gaotang in Shandong Province and Guantao in Hebei Province. The period after the Han Dynasty roughly corresponded to the area north of Pingxiang in present-day Hebei Province and the region around Jin County.
The Meng family took Pinglu and Sanqian as their ancestral hall names. Sanqian Hall: When Mencius was young, his home was close to the cemetery. Mencius learned to bury graves and weep at funerals. In order to educate her son well, Mencius' mother moved to live beside the market. Mencius imitated the sound of selling goods again, and his mother had no choice but to move again. Finally, they moved to settle down beside the school. Mencius learned to be courteous and advance and retreat. Mencius' mother happily said, "This place can make my son a good person." Because Mencius' mother moved three times and paid attention to family education, Mencius became a sage.
The couplets for the Meng surname include: Longshan Yixing (Meng Jia); Seclusion at the Deer Gate (Meng Haoran) Zhu Huan Hepu (Meng Chang) Jie zhen Jing Xiang (孟珙). Lian De Returns the Pearl (Meng Chang) Xiao Cheng Sheng Su (Meng Zong). Xiao Zhu Gong Wu (Meng Zong) The Dao was passed down to Meng Ke (Meng Ke). "Collect your thoughts; Descendants of Ya Sheng (Meng Chengguang). There is no way to teach children like 仉氏(mencius' mother); Respect your husband and look up to Meng Guang together. "Ku Yin Dong Ye Ji (Meng Jiao) The Changchun Talisman was personally written by Meng Chang. Xiong Bian's Seven Essays on the Aspirations of Nifu (Mencius) Du Lingcheng (Meng Haoran), a five-character poet of the Qing Dynasty. Du Sheng Zhou Shiji The Private School of the Sage (Mencius Temple Couplet). The faint clouds and the pale river and Han. Sparse raindrops on the paulownia tree (a poem and couplet by Meng Haoran). Zou 峄 : Heroic spirit, two rooms of righteous energy (Mencius); Brother of fine quality, he received the title of Double Pearl (meng ).