The details of Confucius and Mencius are not clear. My surname is Yue, and I am a descendant of Yue Fei. Although not as prominent as Confucius and Mencius, my family history can be considered to be relatively long.
Generally speaking, male names are given according to seniority. Even if the common name does not have seniority, it must have a "large number". This large number must be written into the family tree, and it must have seniority. OK. If there is no seniority in your name and you still want it to be included in the family tree, you usually need to change the character in the middle.
So, in China, the longer the name, the more prominent it is, haha... If it is at least two words, it is like a lonely ghost without seniority...
But in today's society With such rapid development, this has no meaning anymore.