Male characters using "female" names and vice-versa

Actually, I don't see a problem, sometimes male having female name and vice versa sounds good depending on the character and his position 

It is not really the name in normal sense... Because Fujiwara no Mokou means, for example, Mokou of Fuijwara clan. The name would be Fujiwara Mokou. 

yeah... there's not really much research that seems to go into the names for other nationalities, as far as genders are concerned. oddly, there's only a few female characters that may suffer from a male name, while 4/5 of the male cast are either misnamed or almost their entire character is directly plagiarized from famous celebs. it's a little odd, since you'd think even a quick "common (insert country name here) male names" search would clear that up, but, i suppose that could just be censorship at work. heaven forbid they learn about people called abraham, martin, and john. (hmmm... perhaps those weren't the best examples ) 

In elementary school, there was a boy in my class named Allison.  When we crossed paths again in high school, he had a new name.  I didn't really react to it because, many Asian kids changed their names.  It wasn't until many years later that I learned that "Allison" was actually a girl's name.  I figured his parents didn't know any better, but he got tired of the confusion. 

*Interested*  Do you know why that’s the case? Obviously that wasn’t always the rule, or names like “Abe no Seimei” wouldn’t exist, even if the “no” is more of a functional word than a third name. 

Well, Asians have no idea if they're doing something wrong with the names, that's why you find names like Petrus Ignitus Diabolos or Mariete Corneustimus. 

In the Japanese version of Kingdom Hearts, Lea’s name is pronounced “lee-ah.” But in the English version, they pronounce it “lee,” probably because Leah is a girl’s name.