What are the Flintstones' neighbors called?

The Flintstones is an American animated sitcom produced by Hanna-Barbera Productions. The series takes place in a romanticized Stone Age setting and follows the activities of the titular family, the Flintstones, and their next-door neighbors, the Rubbles. It was originally broadcast on ABC from September 30, 1960, to April 1, 1966, and was the first animated series to hold a prime-time slot on television. The continuing popularity of The Flintstones rests heavily on its juxtaposition of modern everyday concerns in the Stone Age setting. The Flintstones was the most financially successful and longest-running network animated television series for three decades until The Simpsons surpassed it in 1997.

Source: Wikipedia