Yaunyaun doens't look Chinese to me. Yuan Yuan or Yan Yan would, but the a-u-n in that order seem odd.
Repeating the same character makes a name sound 'cuter' in Chinese. My best guess is that it has something to do with Yàn 艳
http://chinese.yabla.com/chinese-english-pinyin-dictionary.php?define=%E8%89%B3
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