I have never been told by a CM that your ADRs must be made under the name of the person that made your resort reservation.
I would call Disney Dining and check, but I have used the
Free Dining promotion 3 times and never had an issue with the name on the ADR not matching the name on the reservation.
A simple explanation:
Each member of your party is able to use dining credits with their Key to the World card (room key). You and your DBF will both have access to your "pool" of credits, so really it doesn't matter whether you use his card or your card to "pay" for each of your meals.