As I stated in this question: How can I change my username in Minecraft: Windows 10 Edition? I have some issues joining some servers, so I want to change either my Minecraft: Windows 10 Edition Username (it looks like it isn't possible at the moment) or my Xbox Live Gamertag (looks as a better choice to me).
Can I change my Xbox Live Gamertag thru web or by the Windows 10 app? (I know that it is paid)
Best Answer
It can be changed through the official Microsoft Xbox website.
Following this link, you can sign in, check your desired gametag for availability, and proceed in changing your tag.