ETA: While I don't think that new APPLIANCES (which are for BOTH of you) constitues being spoiled...the fact that you had a larger part choosing the other names does change my opinion a bit. Maybe he feels if you got to pick Maeve, that he should get this one. However, I still think he should want you to love the name that you both are picking, as much as he does.
ORIGINAL:
Doesn't seem like DH is taking your feelings into consideration very much. YOU have just spent the last 8 or so months carrying this baby, YOU should at least get a (bigger) say in what the name will be!
My DH & I had more of a 'I get to pick the girl name, you get to pick the boy name' deal (even though we could both veto names we didn't like).
I would absolutely not settle for a name I didn't 100% love. If you don't like it, your child probably won't either.
And I could get on board with Sive (sounds unique in a good way and better than others I've heard)...but the spelling is atrocious. I get that alot of people still have to spell their names...but this isn't even close! If the child is going to be applying for jobs in the US, just think of what it will look like. Sive looks unique...Sadhbh just looks like it's misspelled or crazy...at least to me (& probably others), who only speak English.
I get that your DH probably speaks another language...and maybe you do too, I don't know....and I understand his trying to want to maintain culture. I'm not trying to sound insensitive...just wanted you to know what it looks like to me, and probably lots of others. But maybe there is another way to do it...like a middle name?
For what it's worth, I like Sive better than Moyra.
Good Luck...I really hope you can find a name you BOTH love!