I have known two in Australia. It's what the Americans might call a "kick-ass" sort of name, since the biblical
Vashti was a spirited character who disobeyed her royal husband. Good for her!
For the latter reason I'm surprised it has been so long in use - perhaps the Puritans admired her for refusing to disrobe for the benefit of her husband's guests!
I reckon
Boaz and
Ezra and
Kezia and
Merav would make good sibling names - I have no idea how to pronounce
Kezia though.