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Cognomen 淸水 (淸水 ) , in the world, is an extremely rare last name. Much more prevalently, 淸水 is the forename as well as the last name.
Kiyomizu, Seisui, Shimidu, Shimisu, Shimizu, Simidu, Simisu, Simizu, Симидзу, しみず, 志水, 清水, and 邦廣