In the episode where Xiaoxin was given a name for Xiaokui in Crayon Shin-chan, why did Xiaoxin want to say Yunzi but his parents didn’t let him say it?

Xiaoxin just wanted to say that he is lucky~

Didn’t he let them go after being silenced by them~

So Xiaoxin said: " What I want to say is that if you want good luck, you should be called 'lucky boy'!"

Then Xiaoxin's father said: "But don't forget, our surname is Nohara!"

Xiaoxin retorted and said: "It's a nickname~"

Then his parents said together: "We don't need that kind of thing! But because the pronunciation of luck in Japanese is the same as the pronunciation of poop. At that time Aren’t you eating?