For a girl, I prefer the spelling
Brynne, and for a boy,
Bryn. (The double N looks a bit messy to me; I don't like it on either sex.)
It's hard to find a middle name that flows with
Brynn. How about ...
Brynn KatrinaBrynn GenevieveBrynn MelanieBrynn DaphneBrynn CassandraBrynn Marguerite
_____________________________________________________________________
♥
Elinor♥