Why did Rei Sato choose this name?

After some immigrants from our country come to Japan, they usually give a Japanese name. Some add a character to the original name, such as Ben, Lang, Tian and other Japanese-style characters. Some remove the surname from the original name and use the first name. Combined with Japanese surnames, such as this Sato Rei, what should the Chinese names be called Zhang Li, Li Li? and so on.