In ancient China, there were very common names, such as Dalang, Erlang and Yang's son and daughter.

People in China call their son a dog. Call someone else's son your son.

The more formal ones are the eldest son, the second son and the third son, and the youngest one is called the youngest son. Others call their sons gentlemen, second young masters and third young masters.

Call other people's sons big childe, two childe, three childe.

The ancient Japanese used to call the eldest son Taro and the second son Jiro.