I had always heard of the Lamont/MacMillan connection. It was just recently that I discovered that clan Doulgas has Brown listed as a sept as well. I've been able to trace my family back to Lanarkshire, so figured that if a clan connection was a possibility, it was probably to clan Douglas, since that was their neighborhood. I've also come across an article or two stating that MacDonald and Boyd also consider Brown as a possible sept.