"eight characters" refers to birthdates, that is, the date of a person's birth, which is a part of Chinese folk custom. The annual trunk and branch form an annual column, the monthly trunk and branch form a monthly column, and the daily trunk and branch form a daily column. If a person is born at 14: on November 14, 22, the corresponding annual trunk and branch calendars are Gengzi Year and Dinghai Month.
Because the "eight characters" are determined by the official calendar and expressed by heavenly stems and earthly branches, and heavenly stems and earthly branches has five elements, which makes the "eight characters" also have five elements, and the five elements correspond to everything, so everything can be expressed by five elements, such as the son (mouse) belongs to the sun and the north; Hai (pig) belongs to yin water, north. Yin (tiger) belongs to poplar, the east; Mao (rabbit) is a shade wood, oriental. Noon (horse) belongs to yang fire, south; The fourth (snake) is a yin fire, south. Shen (monkey) belongs to Yang Jin, western; Unitary (chicken) belongs to yin gold, western. Chen (dragon) and Xu (dog) belong to the yang soil, and the center; Ugly (cattle) and not (sheep) belong to the earth, the center.
In fact, the traditional naming method has little to do with the eight characters, but mainly with ancient books. Many famous people's names are excerpted from ancient classic books, such as the name of Tu Youyou, the first Nobel Prize winner in medicine in China, which was obtained by the famous sentence "Yo Yo Luming Literature, the apple of the wild" in Xiaoya. Another example is Luo Binwang, a "four outstanding figures in the early Tang Dynasty", whose name and table characters originated from the divination in the Book of Changes: "Look at the light of the country and use the guest as the king". Later, the folk custom of "eight characters" prevailed, and some people used "names" to make up for the shortcomings of the eight characters. There is no theoretical basis in fact, at least there are few records of this kind in historical sites.
Even if you choose a name based on the number of the five elements of the eight characters, it will take years, months, days and hours. It is obviously not in line with the idea of naming the eight characters, so don't entangle these folk customs. After all, folk customs are just legends, and there is no scientific basis. There is no point in clinging to them!