Not popular, but trendy. Popular=common, trendy="nowish." It's a very trendy little syllable. Br- is huge! B- on its own is still unfashionable enough to be counter-conformist (not the same as non-conformist).
Although, maybe I'm mistaken about Br-, which seems to have had its heyday in the 80s. Bree is reeeally big right now though.
http://www.babynamewizard.com/voyager#prefix=br&ms=false&exact=false
No need to be snarky about my teenageish diction! Unless you weren't being snarky.