Stuart Sutcliffe
Stuart Fergusson Victor Sutcliffe (23 June 1940 – 10 April 1962) was the original bass player of The Beatles. He left to pursue a career as an artist. He earned praise for his paintings, which mostly explored a style related to abstract expressionism. As a member of the group when it was a five-piece band, Sutcliffe is one of several people sometimes referred to as "the fifth Beatle".
Sutcliffe and John Lennon are credited with coming up with the name for the Beatles
http://en.wikipedia.org/wiki/Stuart_Sutcliffe.