The Japanese emperor has no surname, only a first name. The emperor is considered to be the descendant of the gods and has supreme power, so there is no need to have sex. Not only the emperor, but also the queen and the emperor's children have no surnames (the emperor's daughter can take her husband's surname when she grows up and gets married).

But this is only the official Japanese statement. What's the real story? First of all, let's make sure that the Japanese emperor is by no means a descendant of God. The Japanese royal family has been very mysterious for a long time. There are many sayings about the Japanese royal family, mainly including the following aspects: One is that the family of the Emperor is descended from the sun god Amara Su. Shinto is the highest god of Japanese Shinto. Emperor Jimmu, the first Japanese emperor, was born 2600 years ago. Now Emperor Akihito is Emperor125th. Another way of saying this is that Emperor Jimmu is actually a famous Japanese god, Yanzun, who ruled the so-called "Bazhou State" on the earth under the command of his grandmother. In 660 BC, Yu Yanzun ascended the throne in Yuan Tan Palace next to the wood, becoming the first generation of Emperor Jimmu in Japanese mythology.