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.