Joke Collection Website - Cold jokes - In the joke, what did the real person name Li Jing's third son?

In the joke, what did the real person name Li Jing's third son?

li gou dan ....

From 100 thousand cold jokes season 1 episode 3

Episode:

At home, Li Jing suddenly got a visit from a Taoist priest. The visitor claimed to be too "2" real. He said that he wanted to accept Li Jing's third son as an apprentice. What is the inside story? Li Jing asked the real person to name his third son. Is it Nezha or Li Goudan? This is a question ... what kind of spark will a real person have with Wang Er, the servant of the Li family, after his official career?