Everyone has his or her own name, and most people only use one name throughout their lives. A good name will also increase our social impression, so choosing a name is a matter of caution and caution for many people. But people nowadays are not so particular. Young parents born in the 1990s will give their children some foreign names. But in ancient times, choosing a name was very particular. Not only did you have to check the birth date and horoscope, but it also had to have connotation and avoid taboos. The family is in good condition, but after giving birth to a child, they have to ask the private school teacher to come and name the child. Naming customs that have been passed down to this day are such as "men don't have the word "tian", and girls don't have the word "xian". In layman's terms, boys can't have the word "tian" in their names, and girls can't have the word "xian" in their names. However, this saying is from our ancestors. There is no scientific basis for what has been passed down, so we can just understand it as tradition.
Because in ancient times, heaven represented the emperor and God. In the ancient people's understanding, heaven was the largest. It is taboo and disrespectful to have "天" in your name. On the contrary, the same is true for the word "xian", which is a symbol of the gods. Only the Jade Emperor can be called heaven, and the emperor's daughter can be called "xian". Don't look at how we call girls little fairies in modern times. In ancient times, it was an unlucky sign.
So our ancestors felt that the words "天" and "仙" were too sharp, so we simply couldn't name boys with "天" and girls with names that couldn't be named "celestial being". Moreover, the infant mortality rate in ancient times was very high, because the medical level could not keep up, so the names in ancient times should be as vulgar as possible, otherwise it would ruin the children's blessings. For example, many ancient farmers would name their children Goudan, Gou Shengzi, etc. .
But not everyone is like this. For example, Mu Tianyan, a famous minister in the Qing Dynasty, did not have the word "天" in his name. Therefore, as times change, the taboo of Tianzi gradually becomes less serious. To sum up, when it comes to naming, there is no science to decide whether a man should be named after heaven or a girl should be immortal. This is a folk custom, so just respect it.