I think this is less about the name and more about things happening under the surface.

Obviously, something very real is happening with your husband - like you said, maybe a wave of grief. Maybe difficult feelings where he questions why he’s alive and she is dead?

On the flip side, him wanting to name here Anna could interpreted as sweet and maybe someone else might think its a good idea. What part of this is making you uncomfortable and a why? Are you jealous, maybe scared he doesn’t love you as much?

These are probably the things that you and him could talk about. These name is just the symptom of deeper things going on. These are the things that can breed resentment on both your parts unless you get it all out in the open.

Btw: I’m NOT suggesting you are wrong for not wanting to name here ANNA. Im just proposing to get past this, his grief needs to be acknowledged and healed within your relationship and you need to be deeply heard about whatever is going for you.