That's fab.
I've said this before, many times - but I cannot count the number of threads I have read on here where a mum with a different surname to the dad gives her baby HIS surname and then regrets it. Now this generally applies when parents split, and heaven forbid you do - but, the fact remains that if you were to split, give the baby his surname and you'd join about 90% of separated mums who end up with their child(ren) having a different surname to themselves despite THEM being the ones the child lives with day-to-day. That's hopefully not going to happen, but it's one of the biggest illustrations why the system as it is now is pretty daft really.
The first thing is - surnames are fluid. They're only as fixed as a person decides they are, we can change our surnames at any point we like. Heck, even the Royal Family randomly changed theirs the second it suited!
But... seems like to our nicely misogynistic society in general, that only applies to women. Fine and expected for you to change your name, but the second it's a man's name... suddenly it's a huge thing. Well, it's not. Good on your DP for seeing why using a surname with a negative history needn't be carried on just because it's on the male side. Well done Kittysparks DP
However, I can totally understand too why he wouldn't necessarily want to change his name to yours. It's the same thing - what about his identity? I can see why he's not thrilled.
We had this too. Slightly different as we were married, but we didn't want to have each other's surname and we also wanted a family name - to have the same surname as one another. So we adopted a new one.
Why don't you put that on the cards? Register the baby with your surname, NOT the horrid dad surname - don't let that one even near your lovely baby's records. Then have a think about maybe adopting a new family name when you get married, for all of you? A good suggestion here is often the middle name of one of you, especially men as their names can often be surnames. E.g. say your DP is called Matthew Daniel Dadname then your new surname could be Daniels. Same for Thomas, Johns, James, etc. Or maybe his mum's name in some way - e.g. if she's called Ann, you could adopt Anson. Elizabeth, you could all be Bethson.
So you register your child now in your name and maybe either change by deed poll when you decide - have a naming party for you all! - or do it on marriage.
We really enjoyed the fact that we changed our name, but that we ALL did it TOGETHER -it wasn't a case of one person 'taking' the other's name. It felt very fair, and also like we were really starting a new family history. Lovely.