What was the first name of Fleming's only child?

Fleming’s only child was named Robert. Robert Fleming was born in 1924 to Alexander Fleming and his first wife, Sarah Marion McElroy, whom Fleming married in 1915.

Robert later became a general medical practitioner, following a medical path that echoed his father’s career. He lived until 2015, six decades after Alexander Fleming died in 1955. The younger Fleming is sometimes confused with his father’s brother Robert, who was also a doctor; that family connection can make biographies of the Fleming family harder to follow.

Alexander Fleming is best known for discovering penicillin in 1928, but his family life unfolded alongside a long medical career at St Mary’s Hospital in London. After Sarah’s death in 1949, Fleming married Amalia Koutsouri-Vourekas in 1953. Robert was Fleming’s only child, and later generations of the family remained connected to his scientific legacy, including appearances connected with the Fleming building at Imperial College London.