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Worldwide, Nishioka (ニシオカ , Nishioka , 西岡 ) is a rare dominantly boy's, but uncommonly female forename. The first name Nishioka is habitual in Eastern Asia, particularly Japan, where it is a very rare female name, and China, where it is a very rare primarily male, but very infrequently girly name. Very seldom, Nishioka is the last name as well as the forename.