Hey so my cousin recently picked up an xbox and I was helping her set up her xbox live/gamertag. When choosing her gamertag she wanted something to do with her name so her friends would recognize her. Her name is Jania, and when picking a gamertag with the word Jania in it, literally everything was taken. The only way to have Jania in her gt would be to put numbers directly after it (ie. no spaces). I even tried something like Jania dfj89341l22fa8, and that was taken. I don't know if it is coming up in the mature language filter or something, but I believe it is highly unlikely that they are all taken.