Oh, come off the WTFs, if you had read and understood my entire post, you might not have frothed so.
But let me explain my position in more detail here then:
Because it seems to me that her main concern is getting back at him. Because he does not want The Big Day. I cant see anywhere that he really does not want to be married to her. That is not really what she is complaining about. He does not want a big wedding.
By insisting baby does not get his name, she is signalling that she does not believe in the relationship, because she is thinking ahead to a life without him. She is signalling that she sees herself and her kids as her KEY unit, not him in it. He might as well be a sperm donor or a marionette to her wedding plans only.
If she really is serious about him and their future together, she needs to look closely at what she wants, as I suspect she also wanted a baby. People dont just go and get babies to appease their partners, or as bargaining chips. I assume she wanted the baby too. So, if she wanted a baby, and he wanted a baby, they both want to be together, it is not smart to sulk over a Party that is not happening and make points about babys surname. She needs to meet him in the middle, and discuss their future, the name of the baby, without discussing the Wedding Day, as that is besides the point.
OP, there will be lots of people who will tell you what is right, in their opinion. It is not so simple as "my baby my name" and "i pushed so I chose", not when you are two people who love eachother and want to be together. Seeing the other persons perspective, and look out for olive branches, and look for the best in your partner may serve you better than sulking and frothing. Even if MN is frothing with you and telling you that you are right to kick up fusses. In real life, in real relationships, it is not that simple. They dont know all the ins and outs.
At the end of the day, it is you, your partner and your children, finding a way that works for your unit together. Who cares what MN thinks of your decisions? Nothing is straight forward.
MN is like a wave of opinions, for and against, if you listen long enough to everybody you might end up more confused than you were before, and likely MORE angry and agitated with your partner. MN does that to you. The group mentality is strong. Think of it as a mass of people standing around you egging you in one direction, then the next, and in the end you dont know what you think anymore, and you just go with the loudest voices, straight to your partner, and kick up arguments that could have been solved by some quiet reflections and honest conversation - with the person that matters.
But that is just my opinion. You dont need to listen. The masses will swear and froth and pick me apart, I bet. Just you see!