I'd be Dearman. I am SO glad I escaped that! I've lived in Alabama for several years and now another Southern state and I honestly don't think I've met anyone with their mother's maiden name as a FN. I've known quite a few with it as their mn but not fn.
But when I was born she wasn't married so for a few years I had that as a last name, so I guess I wouldn't have been likely to be named that.