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Family name Moriyasu (守安 , 森安 , Moriyasu ) , around the globe, is quite a rare last name. The last name Moriyasu is characteristic of New Zealand, where it is a rare surname, China, where it is a very rare surname, and Japan. In absolute terms, it is commonest in China, the United States, and Japan. More prevalently, Moriyasu is the forename as well as the last name.