Congrats! There are some names on the list I'm not familiar with, so would be guessing how to pronounce them. Equally, if said to me, might struggle to spell them correctly.
No matter how 'simple and easy' a name might seem though, some people will always have problems. My name is only 4 letters, and not widely unusual. Think Jane, Anna, Mary for example. Easy names right? But Jane might be spelt Jayne or pronounced Janee/Janae!
Here are my honest, 1st thoughts:
Boys:
Sigurd/Sigvard- are these both pronounced the name? If its pronounced Sig-Vard, I'd spell it like that
Otto- love
Nils- Reminds me of Nil by mouth. Not keen.
August- Quite like. Is the full name Augustus, as in Augustus Gloop from Willy Wonka and the Chocolate Factory? Is it pronounced like the month?
Einar- How is it pronounced? I-nar, EE-nar?
Edgar- Easy to pronounce and spell. I think of a much older man, but it might be due a comeback
Ebbe- I read this as EE-Bee, Like Evie with a B, and assumed it was a female name. How should it be pronounced?
Ivar- I know Ivor, and Ivo, but not Ivar. Is it pronounced like its written?
Girls:
Ilse- Like it, but might get pronounced Il-sa rather than EL-sa.
Asta - pronounced "Asda" - so I am thinking no because of the shop, or would this matter? Yes it matters and would be a no.
Eira- I agree with the above comment about it being Irish
Estrid- Also agree, I prefer Astrid
Hilma- Also reminds me of Hilda, but prefer Hilma
Elfrida- Quite like
Willa- Like it, but somehow feels like a nickname/unfinished. I prefer Willow.
Signe- Never seen it before. Before reading your pronunciation, assumed it was 'Sig-na'
My Swedish friend has a Vilgot and Gustaf and her husband is Thomas.