What was the cartoon show 'The Flintstones' going to be called?

The Flintstones is the first animated primetime American television series. It was broadcast from September 30, 1960, to April 1, 1966 on ABC. The show, produced by Hanna-Barbera, fancifully depicts the lives of a working-class Stone Age man, his next-door neighbor/best friend, and their families.

When the series went into production, the working title The Flagstones was changed. After spending a brief period in development as The Gladstones (Gladstone being a Los Angeles telephone exchange at the time), Hanna-Barbera settled upon The Flintstones, and the idea of the Flintstones having a child from the start was discarded, with Fred and Wilma starting out as a childless couple.