The difference between Bo and Meng is:
Bo is the eldest son, and Meng is the eldest son of a concubine.
There is no difference between Meng Zhongji and Bo Zhongshu Ji. "Bo" means "Meng", and "Bo" means "Meng".
"Shuowen. Ministry of Human Resources": "Bo, eldest." ——Xu Shen of the Eastern Han Dynasty
Bo, eldest. ?For example, after the Zhou Dynasty destroyed the Shang Dynasty, Boyi did not eat Zhou millet. The daughter of Duke Xian of Jin who married Duke Mu of Qin was called Boji.
"Shuowen. Ministry of Human Resources": "Meng, the elder." - Xu Shen of the Eastern Han Dynasty
Meng, the elder.
"Shuowen. Ministry of Human Resources": "Uncle, young man."? ——Xu Shen of the Eastern Han Dynasty
Uncle, young man. Usually refers to the third oldest person.
If there are seven or eight brothers, then all of them except the eldest, second and youngest can be called uncles. "Historical Records: The Guancai Family" records that King Wu of Zhou had ten brothers from the same mother. Among them, the eldest brother Boyi was called "Bo", the second brother Wu Wangfa and the old four weeks Gongdan used the honorific title, and the others were called "Guanshu" by the third brother. Xian has been ranked all the way up to Laojiu Kang Shufeng, who all use the word "Uncle", and the youngest is called "Ji".
"Shuowen. Ministry of Human Resources": "Ji, the name for young people." - Xu Shen of the Eastern Han Dynasty
Ji, the name for young people. Uncle Ji can be the youngest, but Ji is younger than uncle.
Extended information:
Example:
There are several brothers in a family. When naming them, they intentionally use "Bo (Meng), Zhong". ", Uncle, Ji" and other words to show the order of elders and younger ones; this customary practice, if counted from the early Western Zhou Dynasty, has a history of at least two thousand years in our country.
"Bo" is the eldest, and "Zhong" is the second eldest. "Shuowen Renbu": "Bo, eldest brother." "Zhong, middle lord." Uncle is the third child, and Ji is the fourth child. For example, Sun Jian's four sons during the Three Kingdoms period: the eldest son Sun Ce was named Bofu, the second son Sun Quan was named Zhongmou, the third son Sun Yi was named Shubi, and the fourth son Sun Kuang was named Jizuo. This is quite representative of the naming after Bo Zhongshu Ji.
The two words "Bo Zhong" are used together, which means that they are almost the same and it is difficult to distinguish between them. The idiom is "not the same as Bo Zhong, between Bo Zhong".
Some of the eldest people in the rankings do not use the character "Bo" but use the character "Meng". Some people explain that "the eldest son is called Bo, and the eldest son is called Meng." This means that ancient nobles had polygamous wives. If the eldest son was born to the first wife, he would use the word "Bo", and if he was not born to the first wife, he would use the word "Meng". However, in fact That doesn't seem to be entirely the case.