Throughout the world, Ryuyu (Ryuyu 
) is an extremely rare unknown gender first name.
Ito, Yamada, Hayashi, Fukatsu, Okamura, Maruyama, Miyazaki, Kanehira, Onishi, Kawaguchi, Ishihara, Ogasawara, Watanabe, Yamakawa, Yamazaki, Matsumoto, Kashihara, Tsuchiya, Daisen, Kuroda, Koyama, Ono, Sato, Kato, Endo, Ueno, Sakai, Asano, Chiba, Fujii, Inoue, Ikeda, Iwata, Okada, Okubo, Ogawa, Umeda, Sasaki, Takahashi, and Yamaguchi