Yes I am sure. Because it would actually tell me if a username is taken if I try changing your name. Also are you sure it doesn't appear in search? Because it did for me:Are you sure? I've searched the forum for members and only found two usernames that had the words Sakura in it. I can't find anyone that has just "Sakura" as the name?
Oh derp. I was using search member posts and couldn't find Sakura. Derp.