The Enlightened Monk said that the baby boy was a blessing to his father, Yan Han, bringing sunshine and warmth to his otherwise cold and melancholy life. Therefore, they named the baby boy "Xu".
In fact, Yan Han has never believed in these beliefs, because his own name was also given by this so-called Enlightened Monk.
In that instance, the idea was that their family name, which meant 'fire,' was too fiery; so he was given the character "Han" to counterbalance it.
Now, they are naming the baby boy based on his "Han" character. So, should his future child be named "Rain" or "Dew"?
After careful consideration, Yan Han realized that the Enlightened Monk had not named the baby boy "Xu" because of the "Han" character in his name, but because of his cold life. With this explanation, Yan Han could reluctantly accept it.