I like it, althogh spelled
Bryony.
I would rule out Brinley,
Brenna,
Breann right away - they are too similar. Anything that starts in a 'B' or ends in 'ee' is too matchy, imo.
My thoughts:
Louisa &
BrionyAlice &
BrionyAdele &
BrionyOlive &
BrionyGeorgia &
BrionyImogen &
BrionyCarys &
BrionyLucia &
BrionyIsobel &
BrionyAmabel &
Briony