Adsense is strict about its publishers security. Due to this Google doesn't allow to change payee name after creating Adsense account. As per your concern, there is only one solution. You will need to create another Adsense account. As per Google, No one is allowed to own more than one Adsense account. So, in this situation first you should contact to customer care representative about this issue. You can create another account with different payee name on same postal address.