Shouldn't the name be spelt how it was when she was alive?  Aren't most Katherine's of that era spelt with a "K"? I agree that just because it is common doesn't make it right.  There was a common consensus about the way Tutkhamen was pronounced, (toot-em-car-moon, not tootemcarmen)but that was discovered to be wrong only in the past few years, same kinda thing isn;t it?