How did the names of so many palaces in the Forbidden City come from?

This is too complicated. Every palace is named differently. For example, the "Guan Wei Palace" in the period of Huang Taiji was taken by Huang Taiji with a poem in the Book of Songs to express his deep affection for the beloved princess at that time. In addition, there are constellations. Ancient astronomers were particularly good at matching the constellations in the sky with the architectural layout, such as Twenty-eight Nights, Taiwei Courtyard, Ziwei Courtyard, Tianshi Teachers College and so on.

Wei Zi Garden is located in the middle of Sanyuan, so it represents the Emperor of Heaven, and its residence is called Purple Palace. So the emperor, on behalf of the emperor of the world, named the emperor's residence Purple Palace, which is the most supreme place in the world. Since the Qin and Han Dynasties, because people are forbidden to enter the palace, people call it the Forbidden City, so the Forbidden City takes the meaning of the word "Forbidden City".

Other palaces have different names at different times. For example, in the Ming Dynasty, the emperor's bedroom was called Gan Qing Palace and the queen's bedroom was called Kunning Palace. In the Qing dynasty, Huang taiji took one of the two palace names, named Qingning Palace, which was taken from Qing Dynasty and Ning of Kunning respectively.

The names of many "doors" in the Forbidden City are also derived from famous works, such as Wendefang, which is taken from The Book of Songs, Elegance and National Style, meaning to educate people all over the world with rites and music. To sum up, there is no strict standard for the name of a palace. In many cases, some are interested by emperors and some are named after constellations, but in any case, they all reflect the profoundness of China culture.