It's kind of pretty, actually. I much prefer Brianna or Brianne, but Brienne is okay. Though it does kind of sound like a kitchen word. Like you might have beef Brienne with glazed carrots or something.
I think it makes a better middle name than a first name, because as a first name it's likely to be misheard as Brianne.
Alexis Brienne
Courtney Brienne
Erica Brienne
Hayley Brienne
Jessica Brienne
Kayla Brienne
Layla Brienne
Melissa Brienne
Savannah Brienne
You're entitled to your own opinions. You're not entitled to your own facts. -- Daniel Patrick Moynihan