There are two reasons why girls do not choose names with the word "fairy" in them:
Firstly, in ancient times, the word "fairy" symbolized the gods in the sky. In their minds, they are aloof beings, and people still enshrine statues of gods in their homes. Therefore, if a girl's name contains the word "Xian", the ancients believed that this was also disrespectful to the gods, so the word "Xian" should be avoided to express respect for the gods.
Furthermore, the word "仙" refers to "fairy", and fairies in the world refer to the emperor's daughter, so the common people's daughters cannot have the word "fairy" in their names, otherwise it will offend the princess.