As a Dutchie, I'm instantly reminded of the Dutch word
bruin meaning "brown" as well. That puts me off the name, even though it is a legitimate Dutch given name:
http://www.meertens.knaw.nl/nvb/naam/is/Bruin (in Dutch)
I would prefer the archaic spelling of Bruyn, which makes the connection with the colour slightly less obvious. But even then, the name is not ideal - it's better suited as a middle name, if you ask me.
"It is no measure of health to be well-adjusted to a profoundly sick society." ~ Jiddu Krishnamurti (1895-1986)