I have just about the same impressions and associations as you, including stars, though I had forgotten about
Ishtar. It also makes me think of
Esther Williams, the swimmer/actress. In addition to the description you gave, I would say that
Esther is quiet and stately.
Like you, I thought of
Esther June. I also really like your suggestions of
Victoria,
Athena and
Margaret. I'll add
Esther Frances.