No, people are not allowed to have the word dragon in their names. Even if the use of this word is not clearly regulated in the court laws, ordinary people would not dare to do so, because in ancient times, the real dragon emperor was used as a metaphor for the emperor, so the dragon can only be worthy of the emperor. If ordinary people use the word dragon as their name, then Just want to rebel. The emperor would also think that this person was not well-intentioned and would not end well anyway.
It’s not just dragons. In fact, ordinary people don’t dare to call tigers. We can look at the historical figures of many dynasties. Their names generally do not contain words that imply grandeur such as dragon and tiger. Of course, before the early Qin Dynasty, there were families whose surname was Long. This was discussed in Mencius's books. Mencius once praised a person whose surname was Long. However, after arriving in the Qin Dynasty, everyone used the word "Long" with caution, and those surnamed "Long" also changed their surnames.
Some of the rules of the ancients have been passed down to this day and are still believed by some people. For example, this rule is that when naming a child, the more earthy and vulgar the name, the easier it is to raise the child. The greater the meaning of the name, this The harder it is to raise children. Maybe it's because of the rules set by the country in ancient times for people to name their children.
We can imagine that in ancient times, there was a person with a dragon in his name, so the emperor killed him. Then one day the emperor went on a patrol incognito and met a person. His name was also taboo. Maybe it contained the word "tian" or "tiger". Because his parents lived in seclusion and didn't know the world, so they gave their children a grand name. She hoped that her son would be successful, but unfortunately she ran into the emperor's taboo, so the emperor killed him again if he didn't like it. Therefore, people say that the more earthy and casual the child's name is, the easier it is to raise a child, so these words have been passed down.