Also? I'd consider naming all future children *together*. As in, not having one of you pick the first name and one the middle. Pick both names together, choose ones that go well together, etc. It will be a lot harder for him to slip in his mother's choice as the *first* name next time (if it's his turn) if you guys are discussing all names together.
I'd consider changing the child's middle name to the name your DH says he would have liked to use. The paperwork is a pain but it's not the end of the world, and then you don't have to grit your teeth every time you hear the name. You don't have to tell the family, just change it for your own peace of mind. Easier done earlier than later.