What is the name of Sheldon's mother?

Sheldon Cooper’s mother is named Mary Cooper.

Mary is a devout Southern Baptist from Texas and one of the few people who can reliably control Sheldon’s behavior. Although Sheldon is a brilliant theoretical physicist, Mary’s practical authority often cuts through his arrogance. He repeatedly insists that he is not crazy because his mother had him tested, turning their family history into one of the show’s recurring jokes.

Mary is also the mother of Sheldon’s twin sister, Missy, and his older brother, George Jr. Her husband, George Cooper Sr., is Sheldon’s father. The family’s religious outlook contrasts sharply with Sheldon’s scientific worldview, creating many of Mary’s comic disagreements with her son and his friends.

Laurie Metcalf portrays Mary in The Big Bang Theory. Zoe Perry, Metcalf’s real-life daughter, plays the younger version of Mary in Young Sheldon. The surname Tucker can cause confusion because Mary was born Mary Tucker; after marrying George Cooper, her canonical married name is Mary Cooper.