Law: Can the word ri tsu only appear in Japanese male names?

That's not true. The word "Fa" can appear in both male and female names in Japan. In Japanese culture, the choice of names usually reflects parents' expectations and visions for their children, rather than being limited by gender. Therefore, the word "Fa" can be used in the names of Japanese men and women, representing the expectation that children will become disciplined and responsible people in the future.