Solved Windows 8.1 store xbox games user name

Pretext:
1) Newly installed windows 8.1 machine.
2) I want to add the microsoft solitaire games, but I need a hotmail email (since the GUI said I need a hotmail to play solitaire (use the store to get them) on my pc).
3) So I create a new hotmail email and use that, install the solitaire collection, and can finally play solitaire (but only in fullscreen ... for some reason ... the only time I play this, is when I am waiting for some other task to complete, so it makes no sense for me to use these apps in fullscreen-only).

Questions: When I am looking at the screen, it shows me logged on to Xbox Games as DraconianAsh889 in the upper right corner of the screenshot. I have never had an xbox 'account(?)' and I have never heard of 'draconianash889' before - nothing in my newly created hotmail that I regestered to get the solitaire connection, has anything to do with 'draconianash889'. So where does this xbox games user name come from? And how do I change it?


To recap: Question 1) Where does the xbox user name come from? Question 2) How do I change the xbox user name?

I found out how to do it:

1) Login to the microsoft live account that is associated with the xbox live id (see screenshot in previous post). Fx at hotmail.com.
2) Open this link https://live.xbox.com/en-US/MyXbox/GamerProfile (see screenshot below).

3) On the page(GamerProfile) you can click the label 'Change gamertag'.
4) Change the tag to what you want.