I too am curious about this because of a line in the movie "A River Runs Through It", where the father, a clearly Scottish ancestry Presbyterian (I believe) minister, makes the comment about his youngest son, Paul, the journalist/reporter and family rebel, having changed the spelling of his last name in his byline from Maclean to MacLean, stating with obvious disdain, "He's even changed the spelling of his name in the paper to MacLean with a capital L. Now everyone will think we are lowland scots." The disdain was not just for the spelling change, but more so for the distaste of being "mistaken" for a lowland scot because of it.