Persistent (Christmas) earworm alert CXVI

For the past hour, Dean Martin's version of "Rudolph The Red-Nosed Reindeer" has stayed in my mind.  It must be due to the formality in the intro and chorus, with the backing singers saying, "Rudolph," that plays against Martin's relatively informal take on the lyrics.  After all, do you know of any other version offhand in which the singer refers to Rudolph as Rudy?