why did they change the band name to the current known name?
Because in Hamburg, they recorded professionally for the first time and were credited as the Beat Brothers.
Paul McCartney
While in Hamburg, they recorded professionally for the first time and were credited as the Beat Brothers, who were the backing band for English singer Tony Sheridan on the single "My Bonnie". This resulted in attention from Brian Epstein, who was a key figure in their subsequent development and success. He became their manager in January 1962. Ringo Starr replaced Best in August, and the band had their first hit, "Love Me Do", in October, becoming popular in the UK in 1963, and in the US a year later. The fan hysteria became known as "Beatlemania", and the press sometimes referred to McCartney as the "cute Beatle". McCartney co-wrote (with Lennon) several of their early hits, including "I Saw Her Standing There", "She Loves You", "I Want to Hold Your Hand" (1963) and "Can't Buy Me Love" (1964).

what was the name of the first solo album made by a beatle "McCartney" who were the band members? John Lennon, Paul McCartney, George Harrison and Ringo Starr is the first person mentioned above, alive? No, he died in 1980 where was he born? Liverpool were there any movies made that are based on their life? UNANSWERABLE which famous personality was the above discussed person named after? Prime Minister Winston Churchill i would like to know whether the second band member that is mentioned above, married? Yes, to Linda Eastman what was the name of the band at the time when he joined? Quarrymen was he married more than once? Yes, thrice in all
wiki:15528484
Paul McCartney [SEP] 1960–1970: The Beatles
Later that year, during recording sessions for the album "Rubber Soul", McCartney began to supplant Lennon as the dominant musical force in the band. Musicologist Ian MacDonald wrote, "from [1965] ... [McCartney] would be in the ascendant not only as a songwriter, but also as instrumentalist, arranger, producer, and "de facto" musical director of the Beatles." Critics described "Rubber Soul" as a significant advance in the refinement and profundity of the band's music and lyrics. Considered a high point in the Beatles catalogue, both Lennon and McCartney said they had written the music for the song "In My Life". McCartney said of the album, "we'd had our cute period, and now it was time to expand." Recording engineer Norman Smith stated that the "Rubber Soul" sessions exposed indications of increasing contention within the band: "the clash between John and Paul was becoming obvious ...