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Surname オオグチ (オオグチ ) , in all the world, is an extremely rare family name. Much more frequently, オオグチ is the forename as well as the last name.
Ooguchi
サキ, カオリ, アヤカ, アヤコ, マユコ, マサシ, トモコ, リョウ, ヤスアキ, and マサヨシ