Why is it called "Crayon" Shin-chan?

Because Japan has a "silver-like wax gun tip", it is called "wax"

Because it is a painting, it is related to a pen, which is called a "pen"

But he was unwilling to accept the status quo of his small land, and always wanted to innovate, so he could only reclaim a small amount of land to develop, so it was Xiaoxin

So it was called Crayon "Xiaoxin"