What is the name of George and Jane's son?

George and Jane Jetson’s son is Elroy.

Elroy Jetson is the younger child in the Jetson family, the little brother of Judy and the son of George and Jane. He is portrayed as an exceptionally intelligent boy with a strong interest in space science. At school, he studies subjects including space history, astrophysics, and star geometry—an appropriately futuristic curriculum for a child of Orbit City.

Elroy is generally mild-mannered and capable, but he is also adventurous and often becomes involved in the family’s mishaps. His closest companion is Astro, the family’s Great Dane, and the two frequently share stories involving school, gadgets, vacations, or trouble caused by technology.

The wrong options can be ruled out by separating family names from character names. Spacely is George’s boss, not his son; Astro is the Jetsons’ dog; and “George Jr.” is not the boy’s established name. Elroy also appears in later Jetsons films, specials, commercials, and crossover productions.