What's that fatguyintheredsuit's name again?

There is a new commercial airing which shows Santa giving Mrs. Claus a gift of jewelry. She opens the box and purrs, "Oh Nick, thank you!."

Little dog watched this and asked, "Who's Nick?"

"Santa Claus, " I replied, "Saint Nicholas."

"But Santa's name isn't Nick. It's Kris. You know, Kris Kringle."