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I'm not so sure what you're specifically looking for. Because it is a fantasy story, do you want real or fictional surnames? and if real, which do you perfer? English, Scottish, Spanish, Italian, French, German etc? rare, common, unique surnames? From the looks of it, the family seems of Latin and English heritage. Vesta and Vivian are Latin names, so perhaps a rare/unique Latin&English mixture of a surname. Here are some cool surnames I've found.

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Vesta Vallerine
Vesta Valliant (or Valiant, Valiante, Valliante)
Vesta Prideaux
Vesta Cornelius
Vesta Corales (Spanish)
Vesta Aurora

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and for the other characters

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Sally Bess Whistleton, Sally Bess Wigglesworth, Sally Bess Willsworth (or Willingsworth)
Deirdre (Irish) Sherry (or McSherry), Deirdre Flannery, Deirdre Gallion, Deirdre Fair
Lily Rose, Lily Redd, Lily Glym, Lily Flute
Pansy Violet (or Violette), Pansy Botherham
Daisy White, Daisy Garden
Jonathan Levison, Jonathan Wadsworth, Jonathan Templeton (??? Jonathan is too broad, any surname can fit)

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I hope this helps