(((HUG)))
I'm sorry your first weeks with DD were so awful. You can't get them back, but you do have the rest of your life & hers to make up for it 😊😊
Your DH manipulated you when you were vulnerable & I know myself well enough to know I couldn't forgive that, but I'd have tried to when I was much younger (causing myself a lot of anguish).
How are things between you now?
Have you spoken to him about changing her name?
Do you plan to have any more children?
Sod everyone else, you & he ate the only ones that matter (and frankly, he only matters at this stage because you need his permission to change her name).
DD don't stress yourself about that, a lot of kids have name strops! No matter what. Nothing to say which she'd have preferred - probably something SO weird we can't even imagine it yet!!)
i think children do 'make' a name. There are very few names I probably wouldn't warm to over time, but that's not to say if it was my child, I'd want to have to warm to them!!
personally I don't care for Isla, but I would warm to it if a friend chose it & I cuddled the baby & watched her grow.
I mean if someone handed me a baby girl & said 'she's all yours as long as you call her 'island' I'd take her in a heart beat! But if I birthed a child, and was told I had to call her island, I'd be telling them to F'off.
As discussed I don't think the actual name is the issue, but how it has come about & how you're going to deal with that!
honestly, don't worry about anyone else, IF you change it, they'll have to accept it & move on! YOUR baby, YOUR choice xx,