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I prefer [name_f]Ebba[/name_f] for no other reason than all those different consonants in the middle of Embla make it seem choppy to say, for me at least.
I prefer [name_f]Ebba[/name_f] as it seems easier to say.
Some factors which help me find a preference between names are ease of spelling and pronunciation, flow with the surname and middle name, potential nicknames and how could a name sounds with a few boy and girl names that you would consider for future children (ir existing children, if you have them)
What about nicknames? [name_f]Do[/name_f] you like Ebby or [name_f]Em[/name_f]/[name_f]Emmy[/name_f] more? Because sure, she might not go by one, but she might choose to.
I think I slightly prefer [name_f]Ebba[/name_f] but I’m really not sure!
I definitely prefer [name_f]Ebba[/name_f]. I think [name_f]Ebba[/name_f] [name_f]Rosemary[/name_f] would be so cute and classy. I’d pick [name_m]Nils[/name_m] as the second middle name. [name_f]Ebba[/name_f] also has two great meanings (fortress of riches and strength of a boar).
I also prefer [name_f]Ebba[/name_f]! Embla is lovely but I do stumble over it a little, I think it’s the m-b-l in a row.
Greyblue made a great point about preferred potentional nns. That might help you decide
[name_f]Ebba[/name_f] [name_f]Rosemary[/name_f] [name_m]Per[/name_m] is perfection!
I think Embla is prettier.
I was convinced [name_f]Ebba[/name_f] is just Swedish way of spelling [name_f]Emma[/name_f].
I would choose Embla myself due purely to the likeness of [name_f]Ebba[/name_f] to [name_f]Emma[/name_f]. At first I deemed it as a positive by making [name_f]Ebba[/name_f] seem more grounded, but the more I say it the more I could see people mistaking it for [name_f]Emma[/name_f] when spoken which would grow tiresome quickly imo. Whilst Embla is very uncommon the (admitedly more distant) likeness to [name_f]Amber[/name_f] and [name_f]Emma[/name_f], and the nicknames [name_f]Emmie[/name_f] and even [name_f]Emma[/name_f], keep it well grounded.
Both are stunning names though and I can see why one is was such a toughie. Good luck 
Personally, I prefer Embla, and agree with and absolutely adore the description you gave it, which honestly made me love it even more (I do tend to prefer the ‘earthier’ type names). The fact that Embla is a direct link to your/her Norwegian ancestry is fantastic, too. I also feel that Embla would work better in general in the modern, English-speaking world, being that while it is quite unusual, it has that all too familiar [name_f]Em[/name_f]- beginning and -la finish. As potentially silly as it may sound, Ebba also sounds to me a lot like someone with a cold or allergies (sinus obstruction) saying ‘Emma’.
Embla [name_f]Rosemary[/name_f] [name_m]Per[/name_m] makes for a lovely combo.
I think people might mishear Embla as emblem. [name_f]Ebba[/name_f] sounds super pretty to me!
This is tough because these are too of my favourites and i too and up loving similiar names.
In this case, i think i slightly prefer [name_f]Ebba[/name_f]. It’s strong but sweet and bubbly, earthy but full of kick, powerful but soft! I knew a lovely kid called [name_f]Ebba[/name_f] so that helps too
Embla sounds prettier to me, and, being familiar with mythology, I like the first woman association. [name_f]Ebba[/name_f] is too harsh for my taste, even though I usually like clunky names like [name_f]Constance[/name_f], [name_f]Myrtle[/name_f] and [name_f]Agnes[/name_f].
I prefer [name_f]Ebba[/name_f]. I imagine her as a girl with gumption!
Embla sounds like emblem to me, and the “-bla” sounds a little too like “blah”, even with the emphasis on the first syllable.
Both lovely, but Embla has my heart.
I love the mythological backstory, it sounds so beautifully warm, earthy and autumnal, and is just such a fantastic underused name.
Also (and don’t take this the wrong way, because I think it’s a fab name), [name_f]Ebba[/name_f] has the potential to sound like [name_f]Emma[/name_f] with a cold. It’s one of those names that I had never heard of before Nameberry, so I’m just wondering if it’s unfamiliar enough generally to be misheard in that way. Embla seems clearer, at least to me.
Both sound fantastic with your middle name ideas, so no help there!
I find Embla a bit clunky to say. A bit like “[name_f]Em[/name_f]-bluh” which I’m not sure I like.
[name_f]Ebba[/name_f] is easy to say, but I can see her forever having to repeat her name when she introduces herself to people “No, not [name_f]Emma[/name_f], Eh-BA”.
I’m having a really hard time picking, but I’d go with [name_f]Ebba[/name_f].