Actually, it was "
Katie Scarlett O'Hara".
Off the top of my head, I can think of four reasons the aforementioned character was named
Scarlett (and I'm sure others can come up with a dozen more).
Red is the color most often associated with passion.
Red is associated with scandal.
Red is the color of the land/dirt in
Georgia that the character finally learns to value.
Red is the color of blood, and by association: women and war. Certainly,
Scarlett was a woman at war... with the Yankees, cultural and societal morals, other women and perhaps most of all, herself.