If there are five sons, they are usually called Bozhongshu Jiyou, or Bozhongshu Jishao
If the ancients had a big family, they usually had two-character names. Add one character after Bo Zhong Shu Ji; if it is not a big family, it is usually a single name. Even if it is a two-character name, Bo Zhong Shu Ji will not be used.