Why do people always laugh at a friend of mine named Guo Chunhai?

It’s a joke! ~There are many versions online! ~A common thing is that

A prostitute gave birth to a child to support her in old age, but she was worried about naming it because she didn't know whose child it belonged to. He slept with three men that day! ~Then she found an old monk to help name it. The old monk asked the three men what their last names were. She answered: One is Gao, the other is Li, and the other is Chen. The monk said that the child's surname was Guo. She asked why. The monk replied: Take the upper half of the character Gao, the lower half of the character Li, and the left half of the character Chen, so the surname is Guo. She said okay, let’s choose another name. The monk said spring. She asked what to say? The monk replied: Three people share the same day, so it is spring. She asked the monk to please choose another word. The monk said the sea, and she asked what the explanation was. The monk replied: Everyone has this child, so it is the sea! So this child is called Guo Chunhai