Family name Ryuyu (Ryuyu 
) , throughout the world, is a very rare last name. The family name Ryuyu is habitual in Eastern Asia, particularly Japan, where it is a very rare surname. Predominantly, Ryuyu is the forename as well as the last 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