first name is the owner
Yes. If your name is on the title you are considered owner of that car.
The person who the car is registered with. You are paying for a car you don't own.
Yes, you can. Stealing is the taking of something without permission. It does not matter what relationship you have - only that it was taken without permission.
Call the bank. Explain the situation. Try to get the loan transferred into his name. If he doesn't co-opperate, call the cops and report it as stolen.