The name Shinnosuke was originally written on a piece of paper by Xiao Xin's father, Hiroshi. Then it rained heavily, the paper got wet and the handwriting faded. Finally, only the words Shinnosuke can barely be read, so I patted my forehead and called it Nohara Nosuke.

As for the crayon Xiao Xin: Xiao Xin is similar to China's nickname. For example, Li Ming's habitual name is Xiao Ming and crayon. First, the author's drawing pen is crayon, and the word crayon is slightly cute with Xiao Xin. So crayon Shinchan was born.

Extended data:

Mr. Yoshito Usui said that he created the image of Xiao Xin, because when he observed his children, he found that their ideas were often so unique that the author was attracted by their world. All children have two sides: smart and naughty. This duality is of great interest to the author. Conversely, the author also embodies this duality in his own works.

He also admitted that "Xiao Xin" was partly a copy of himself. According to him, there are many things in Crayon Xiao Xin that reflect his real life, such as: Xiao Xin's father is somewhat similar to himself; Xiao Xin and his father have two thick eyebrows, because the author doesn't like his eyebrows to be too sparse.

References:

Baidu Encyclopedia: Crayon Shinchan