Hi steph and welcome to the forum
If you change your name by deed poll, your former names will also be listed in the bankruptcy advertisement so you gain no real advantage there.
You will need to continue to make the payments to your secured creditors regardless of whether you enter bankruptcy proceedings, offer an IVA or propose a DMP settlement, as these creditors have security over your property and therefore the ability to commence possession proceedings in the event that you default.
Your monthly payments would be based upon your individual income and expenditure, and it is unlikely that you would be allowed to retain a car valued at £7,000 - but the Trustee may allow you a sum of money, perhaps £3,000, to buy a replacement cheaper model.
I do not feel that bankruptcy really has any worse effect on credit ratings, than doing an IVA or a DMP, but this is a decision for individual lenders to make, and some might have differing opinions. When you are seriously in debt, preserving your credit rating is usually the last thing to be considered.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk