Thanksgiving? It is too much?

What about Hosanna?
Thanksgiving is just not a name and if your DH loves it so much he can introduce himself as Thanksgiving if he likes .....

No, OP. It sounds like a minor character character in The Crucible — those Puritan naming traditions where people were called things like Obedience Smith, Be Thankful Grimes or WashedinthebloodoftheLord Jones.

I like Faith and Felicity, I think Felicity goes better with your other daughters' names.

It's not great. You can use Grace or Joy if you want, it really doesn't matter if you know people that used those names.

I think you need to find a name that represents what she means, but subtly. I don't think I'd want to carry a name my whole life which was so representative of my parents' sadness turned to joy. It might be something of a burden.

Peace might be an option too - one of the fruits of the Spirit, and always a good thing to wish/pray for on behalf of one’s children.

Faith and Bliss are gorgeous. Although not to my taste, Trinity fits perfectly.

Naomi is Biblical, means something like 'sweetness' or 'pleasantness', and goes well with Honor.

Grace was going to be my suggestion as I think it’s beautiful, but I’ve seen that you can’t use it.

Faith would be lovely too, or Promise.

I once knew of a Moreblessing.

Eliana, as suggested by a PP, is beautiful. I also think Felicity and Gloria are extremely apt. Laetitia means joy or gladness.

My church is about 50% white British and 50% black African.

Girls in the church include Prayer, Hope, Angel, Blessing, Grace, Patience and Constance. Boys are Patient, Genuine, but mainly more British names.

I can see why you like Thanksgiving,and the meaning of it is lovely, given your loss of baby Hope. But it's quite a name to live up to and I don't think she'd thank you for it.

I'm so sorry for your loss.

I don't think I've ever commented in a baby names thread but please don't call your daughter Thanksgiving. It really is not a name and she will be laughed at her whole life.

Sorry for your loss OP
I agree Thanksgiving isn’t suitable though - it’s not a name. I love Prudence and Constance, they would be on my list but I can’t use them for various reasons. Felicity and Verity are nice too. If you liked Joy but can’t use it then I think Felicity is a good alternative.

I knew someone called Blessings once, and everyone (including me) thought that was such a lovely name, and really suited her too.

I came to agree with @ViolaValentina - Felicity is a lovely virtue name meaning happiness or bliss.

I think Thanksgiving is a bad idea OP, though I'm really sorry for your loss 💐

Others I like are Hope and Faith.

Also, don't worry about using names that friends have used, no one owns a name and you should absolutely use the name if you want to!

I really, really don’t think you can. Would you like to go through life as Thanksgiving?

Faith works well - through the tough journey to get to DD3 you and your DH kept “faith” in it all and this is your outcome. I think it’s lovely.

Gift - really grew to love this name on a girl I once knew at school. Your DD3 could be your gift after what you’ve been through?

Or I also thought of Abigail - Father’s Joy.

How about Hope, Grace or Joy? Agree that Thanksgiving is a mouthful though the sentiment is nice.

but to ask if it’s a joke is actually quite hurtful and rude

I appreciate this is a subject close to your heart, but when you are proposing such an OTT name, it’s really not surprising that people ask if it’s a genuine question. If anything, the reaction from posters should show you and Your DH just what you’d be saddling you’re daughter with for the rest of her life if you choose this. She’ll need a far thicker skin than you.
There are some lovey suggestions on here though.

So sorry for your loss.

I agree with the other posters - Thanksgiving is truly awful. I'm personally not a fan of matching sibling names, at least not in an obvious way. If you really want a virtue name, then I think Felicity, meaning 'happiness', would be nice. Otherwise my choice would be Beatrice - 'she who brings happiness'. Or possibly something a bit different with a similar meaning, like Farrah or Ilaria.

OP I am sorry for your loss.

I agree with others tho that Thanksgiving is a bit much. I love Felicity and Blessing also goes well with your other DDs' names. Honour, Hope and Blessing - lovely. Verity tho it has a different meaning is another lovely name and was used by a friend after a loss of a child.

I think that would be a hard name to handle.

Celeste?
Patience?
Merryn means joyful, and you could shorted to Merry too

I don’t see Thanksgiving as a virtue name so for me you wouldn’t be achieving what you wanted by choosing it

Do you like Prudence? Or Constance?
There have been some other lovely suggestions. Best wishes

Blessing or Precious seem more fitting to me. Good luck.

Charity or Mercy would be my choice for something more unusual. Otherwise Faith is lovely and very classic.