Why are so many disciples of Confucius called "Zi He"?

That's just what they said.

In the Spring and Autumn Period, surnames were not as rich as later.

Characters are mainly based on names.

Like a Duanmu tribute.

Ran Geng zi bo Niu

Personally, I think when they get this word, if they have a brother, they will take it according to the same principle as Uncle Ji, and if they don't have a brother, they will call it something. It seems so, and I didn't delve into it.