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Last name Mitsumasa (Mitsumasa , יונאי ) , in all the world, is a rare cognomen. The surname Mitsumasa is habitual in Israel, where it is a rare surname, Japan, and Malaysia, where it is a very rare surname. In absolute terms, it most frequently occurs in Japan, Israel, and China. Very seldom, Mitsumasa is the forename as well as the last name.