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To honor your grandmother you can also choose a name with the same meaning, Ester means 'star' so you could use these as mn or fn to honor her:
Danika / Danica
Sitara
Yildiz
Stella
Sterre
Seren
Dara
Astra
Astraea (I love this, but it would be hard to spell)
Estrella (mn of my little cousin :)

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An other way to honor her would be using another gemstone:
Almas
Esmeralda
Neelam
Safira (I think this would go well with Azalea)

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Maybe you could name one with an gemstone and one with a star :)
From your list I like Azalea, Vivian, Sage
I dislike Bianca, the others are ok.

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other suggestions:
Rosalia / Rosalina
Amaya
Oleander ('rose tree' Greek)
Verena
Vanora ('white wave' Celtic)
Celina
Leanora
Kalea
Eveline

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