Mogu seems to be an Oni(japanese ogre) and the name probaly stems from the word Moghul. In 5.2, fem mogu models will be released and the are AWESOME!
Female Mogu
http://www.wowhead.com/news#modelviewer:1:46975:0:10+0
http://www.wowhead.com/news#modelviewer:1:46974:0:10+0