Green_Grass - 4:37 am on May 14, 2010 (gmt 0)
To state the obvious.. How can any one change your payee name in the adSense account. This is simply not allowed. A person needs to re apply for a new adSense account.
I think, you mean that the code was changed in your website. That is a website hack.. not an adsense hack.
If the name was changed in the adsense account, then Google has been hacked. Not only your account.