Curious about this word after I saw the movie Gilda (1946) with Rita Hayworth as the title character. She gives her phone number to a dance partner with the exchange as Cujo and the movie setting is in Argentina.
http://www.springfieldspringfield.co.uk/movie_script.php?movie=gilda
Never mind. I'll give you mine.
Cujo 3 - 0 - 1 - 7.
IMDB has this for the movie Cujo (1983):
www.imdb.com/title/tt0085382/trivia
A rumor has circulated that "Cujo" is an ancient Indian word meaning "unstoppable force." In reality, Stephen King made it up himself when writing the novel.
Cujo means whose or whom in Portugese.
Cujo was a famous bull in the Charolais breed. I could not quickly find his birthdate.
CC Cujo was the Bull Calf Champion at the 1982 World Show in Louisville.
I don't know if the CC stands for "carbon copy" or "Champion Charolais" or what. If that's the original Cujo bull, then Stephen King's novel might have inspired the bull's name; if the original Cujo bull was a generation earlier, it might be the other way around.
It's quite possible that King himself might be unaware of what inspired the name. We take in so much information, and later on, we're not sure what we've originated, what we've recycled.
Given the reported alcoholic condition Stephen King was in at the writing of Cujo, no one may ever know where he got the inspiration for the name.
http://www.imdb.com/title/tt0085382/trivia
Stephen King has admitted several times that he was so into his alcohol addiction at the time that he does not remember writing the book.