I really like this. I has kind of a medieval feel to me and seems rather soft and sweet, which I normally dislike in male names, but this one just seems to work. I might run it by DBF later.
Branwell David is kind of awesome imo. Again not sure why, it just has some sort of snap to it.
Other combos:
Branwell Harper
Branwell Darcy (too much Bronte and Austen in one name?)
Branwell Lawrence
Branwell Orson
Seoras Branwell
Vladan Branwell