In fact the names Akako, Katana, Usagi and Nanashi were recently deleted because they only belong to characters in Japanese anime or manga, not to real people. Admittedly the Japanese section is still in poor shape.
I must point out however that not all of the names on this website belong to real people:
http://www.behindthename.com/nmc/lite.php - names from literature
http://www.behindthename.com/nmc/astr.php - names from astronomy
http://www.behindthename.com/nmc/myth.php - names from mythology
Maybe this site needs a category like "pop culture" or "entertainment"? Names from anime (as well others already in the database such as
Anakin or
Draven) would fit well there.