When the ancients gave names, the middle characters were always "Zhong" and "Bo", which were ranked:
The order of ranking of brothers in ancient times: Bo, Zhong, Shu, Ji, According to the "Mandarin Dictionary" records: "Meng, Zhong, Shu, Ji, are the different words for brothers and sisters." At the same time, Bo, Zhong, Shu, Ji also refer to the order of eldest brothers. The dictionary explains: "In the order of brothers, the eldest brother is Bo, the second is Zhong, the third is uncle, and the youngest is Ji. If there are three brothers, they are called Meng, Zhong, and Ji."