someone change my name

If your name was changed by Microsoft, it likely means your old name was inappropriate or went against the code of conduct. Unfortunately you can't recover it if that's the case.

But it was normal i guess "Pointy Barbacue"

you have to pay $10 to change your name back

The first thing is to check the enforcement teams website at enforcement.xbox.com and it will tell you if your gamer tag was forcefully changed by them for a violation of the code of conduct.

If it does not show an enforcement action.

Do you still have the same Gamerscore as before or is it like a 0 Gamerscore which would normally mean it was a new account that you signed into and it created a new gamertag for you and you would want to make sure you are signed into the correct account.

No one on the forums can change tour name. You will have to pay $10 for a name change

I had already seen, because my account had not used it in 3 or 4 months and I think I will have to pay the $10 thanks by the way.

If your name was changed by Microsoft, it likely means your old name was inappropriate or went against the code of conduct. Unfortunately you can't recover it if that's the case.