Husband trying to change boy name at 30 weeks

So my husband and I have decided on Maxwell for our son who was going to be born in July. We decided probably… 12 weeks or so and have told everyone. Tonight my husband says he is rethinking Maxwell and likes the name Maxson. He wants to change it. I actually really don’t mind the name but we’ve already told everyone Maxwell. Granted, the nickname is still be max (which is what he would go with 90% of the time). When I googled it I was surprised to see it is actually a name, just not very popular. I don’t know… I actually like it but wonder if it’s *too* different and I feel weird changing it after we have been saying Maxwell for months. Hubby just wanted to announce the name change when he is born. Thoughts?