What does Paladin Zhang Daniu mean?

Professional paladin name Zhang Daniu! In case others don't know their occupation, a professional name is added directly in front of the name, so it is called ~ ~ ~ ~ ~ ~ Paladin Zhang Daniu!

I see ~ I think it's a leftover male knight ~ I guess it's an old man who hasn't met anyone yet ~ Zhang Daniu may be a name or a stupid description of him ~ I've heard that there are surplus male soldiers ~ they are all bachelors entertaining themselves ~