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Family name Ryousuke (リョウスケ , Ryousuke ) , in the entire world, is a common surname. The last name Ryousuke is habitual in Eastern Asia, particularly Japan, where it is quite a common surname, and China, where it is an extremely rare surname.
Sam, Muñoz, Sasaki, Adachi, Kagawa, Kurita, Tanaka, Namiki, Fukaya, Yamada, Magura, Sakurai, Kikuchi, Hayashi, Fujisawa, Munakata, Sakuragi, Takeuchi, Terajima, Watanabe, Kobayashi, Komochi, Takahashi, Utino, Ikeda, Abe, Kon, Kun, Mori, Sato, Segi, Amou, Kato, Kido, Okabe, Gamo, Ueno, Satou, Sakai, Souma, Akagi, Takai, Tsuji, Nagae, Nakai, Hara, and Nakahashi