Xu Fu was an alchemist of the Qin Dynasty, an emissary who searched for the elixir of immortality for Qin Shi Huang, and a person who dreamed of Qin Shi Huang's chaosi. He is said to have taken 500 boys and girls to Japan.
Xu Fu is gone, and some people speculate that Emperor Shenwu of Japan is Xu Fu, but this statement is flawed, Emperor Shenwu was born in 711 BC and founded in 660 BC
Xu Fu only went to Japan in 210 BC, and the birth of Emperor Shenwu was more than 500 years earlier than Xu Fu, so this statement is not reliable.
There is no official record of Xu Fu in ancient Japan, but there is a copy of the Miyashita Fuji Ancient Documents, also known as "Xu FuKu Kochi", in the home of Miyashita Yoshitaka in Fujiyoshi, Yamanashi Prefecture.
The book records that Xu Fu came to the Japanese archipelago during the time of the seventh emperor of Japan, and successively visited Kyushu, Shikoku, and Mt. Fuji.
After Xu Fu came to Japan, he married and had children, and gave birth to a total of seven sons, he changed seven sons to Japanese surnames, the eldest son surnamed Fukuoka, the second son surnamed Fukushima, the third son surnamed Fukuyama, the fourth son surnamed Fukuda, the fifth son surnamed Fukuzumi, the sixth son surnamed Fukukai, and the seventh son surnamed Fukuzumi, and then sent to seven places.
Xu Fu's descendants spread all over Japan and gradually multiplied and flourished, Xu Fu called himself Xu Fu in the Qin Dynasty, and there were statues of Xu Fu all over Japan, and they were worshipped by the Japanese.