You'll definitely need a card in your name when you pick up the car.
If you're talking about using someone else's card to pay for a prepaid name-your-own-price reservation, in theory that might be possible, but I don't see a place on the form to put in a different name for the credit card, so I'm pretty sure you'll need the credit card to be in the same name as the driver.
Is there time for your employer to get you another card on his/her account as an authorized user?