It is RAY. Match the “o” in Ray/Roy to the “a” in Christmas and they are the same. Ray signed the yearbook, not Roy.
Well, if that is the case, who is Ray? Is there anyone from that school with a yearbook from that year? I have a friend from another high school in the area. He would have graduated around the same time. Unfortunately, he is in bad physical condition due to strokes. He was sharp as a tack five years ago. He would be all over this. I have another friend from the area, but he is closer to my age. So he’s no help.