Answer: Nowadays, babies are named according to their eight characters and five elements. The date of birth is used to determine the eight characters, and then the character suitable for the five elements is judged according to the fate of the entire eight characters. If the character "一" is suitable for his horoscope and five elements and brings prosperity, then it is good to use the character "一" together when naming him. If the character "一" is not suitable for his "five elements" and is a taboo character for his "five elements", then it is not good to use the character "一" in naming.
Another thing is: when most people choose names, they like to start with characters that are directional and have good meanings. Few people use the same name.