I've uptaded some info:
http://ja.wikipedia.org/wiki/%E4%B8%...BA%8C%E9%83%8E
http://ng-stg.hp.infoseek.co.jp/gm/name/na.html
And more important, I've changed his family name to Nakashima (なかしま), but this could be another GMCL's error. Someone can confirm this?