How did Pluto get its name?

It was named for a child’s pet.
It was named for a cartoon dog.
It was named for a god of the underworld.
all of the above

Pluto was named for a god of the underworld, but it is also rumored that the choice of name was influenced by the fact that it was discovered by astronomer Clyde Tombaugh around the same time that the Walt Disney character Pluto the Dog was gaining popularity. The final decision on the name was primarily influenced by the god of the underworld association.