Final answer:
The first single released by the Beatles when they were known as the Beatles was 'Love Me Do'.
Step-by-step explanation:
The first single released by the Beatles when they were known as the Beatles was Love Me Do. It was released in the United Kingdom on October 5, 1962, and reached number 17 on the UK Singles Chart. The song was written by John Lennon and Paul McCartney, and it showcased the band's harmonies and catchy melodies that would become their trademark.