Well John started group the Quarry Men in 1957. Later in 1957 he met Paul McCartney and he joined while they were still known as the Quarry Men. While still the Quarry Men George joined. They switched from skiffle to rock and roll and changed the name to Johnny and the Moondogs. They changed that to the Silver Beats then the Silver Beetles, then Silver Beatles and finally the Beatles.
With John, Paul and George all forming under one of those names - and they were the Beatles. Prior to that would just be John. And that's only 25%.