Mao

Mao is actually a gender neutral name in Japan. I have known a girl named Mao and two boys named Mao, one of whom is my cousin.

Well, there are several anime/manga/game characters with this name (a deal of which are female, true.) On the other hand it does seem a more masculine, either way at most. Then again part of that may be attributed to the main character (male) of the game Disgaea 3 having this name.

I've never heard this on a female so I'm not sure why it's considered a feminine name. Also Mao Zedong isn't Japanese so I don't think that should count.