I received an email a few minutes ago asking to change my security questions on minecraft. As I am at work, I would have no reason to change it. When I logged into my account I was greated with "You have not logged in from this IP before, please enter your security questions". The name in the upper right hand corner is BedirOyunOffical. I was able to unlock my account via security options and I checked on the profile. They changed my name to "Bedirhan Oktu". The last time I played on any servers was in December. The last time I played at all was last week on an offline world I made for about 5 minutes. I do not have mods installed and I only play on servers run by people I know. My email was hacked last month, so this might be related, but I was able to login to that account and my minecraft account since then.

Just check on your account to make sure its secure.

Edit – I cant find where to change my username back to what it was.