I really like all 4 names. I like
Helena pronounced the way you mentioned (as way as heh-LAY-nah), but if your last name is a word name, like Hill or
Hall (etc.), it might not work--sounds too much like "hell on a hill" or "hell in a hall". :-/
I prefer
Eve to
Eva (I prefer EE-vah to AY-vah), but
Eva is lovely. I like
Susanna (prefer
Susannah) as well. I like both a little better than
Astrid.
How about
Susanna Eve /
Evelyn? Or
Susanna Astrid,
Eva Astrid?