Naho Sugiyama (杉山 直歩, Sugiyama Naho, born February 3, 1978), also known by her nickname Sugirock (スギロック, Sugirokku) or Sugi Rock, is a Japanese female mixed martial arts (MMA) fighter. She has competed professionally since 2009. In 2011, she became the first Jewels featherweight champion. Besides Jewels, Sugiyama has also competed in MMA promotions Valkyrie and Invicta Fighting Championships. As of November 1, 2013, Sugiyama is ranked as the number four female atomweight (96-106 lb) fighter in the world according to the Unified Women's Mixed Martial Arts Rankings.