What is the name of the Jetsons' alien pet?

The name of the Jetsons' alien pet is Orbitty.

Orbitty is a small, colorful alien creature who becomes the Jetson family's second pet. Unlike Astro, the family's dog, Orbitty has spring-like legs that allow him to bounce and move in an exaggerated, highly recognizable way. His appearance adds an extraterrestrial twist to the household's already futuristic lineup.

Orbitty is associated especially with the 1980s revival episodes of The Jetsons. Although he appeared in title cards and related material connected with the franchise, he was not part of the original run's regular episode lineup. That gap can make viewers mistakenly assume he was always present beside Astro.

Another common confusion is treating Orbitty as a robot or an ordinary space animal. He is presented as an alien pet, and his unusual body, expressive sounds, and bouncing movement distinguish him from Astro and from Rosie, the family's mechanical housekeeper.