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Cognomen Ritsuki (Ritsuki ) , all around the world, is an extremely rare last name. Much more frequently, Ritsuki is the forename as well as the last name.
リツキ
Kato, Inoue, Imada, Umeda, Mikami, Davison, Tsubota, Yoshida, Nakashin, Hatanaka, Watanabe, and Yamaguchi