My Minecraft name was simply changed the 1 was ccFeroxcc then Kill me now and now what I have changed myself. MarkingArrows?
Then you should change your password quickly.
But what exactly is your question now?
Did I think you got hacked
Well, if you don't change your name, someone else will have, nech.
Your password has been hacked and your account has been hijacked. It will probably be used for scamming and gruffing. Expect that sooner or later the account will be permanently banned due to abuse.
Wknow a friend maybe your login details?
If not, you should change your password immediately because if, for example, your account has been hacked, data will be deleted on servers. Or other people can be blackmailed.
It could happen that the account will be blocked sooner or later.