I love Scandinavian names! I kind of know your pain when it comes to finding names that are Scandinavian but sound nice in other places. My issue is because I don't live in a Scandinavian country.
Your list is wonderful. I think any of them would work, honestly. Personally, I love
Axel and
Elis from your boy names.
Sixten is really cool too. I keep wanting to read it like 'sighs-tun' while in the midst of reading your list, but it's a fun name no matter how you pronounce it. My favorites in your girl names would be
Sigrid,
Tyra,
Liv,
Iris, and
Elvira.