What was C.S. Lewis’s full first name, including the name he usually abbreviated?

C.S. Lewis’s full first and middle names were Clive Staples. He was born Clive Staples Lewis in Belfast, Ireland, on 29 November 1898.

Lewis generally used the initials “C.S.” in his published name. Friends and family often called him “Jack,” a nickname he adopted during childhood after the death of a childhood dog named Jacksie.

The name “Clive” can cause confusion because Lewis rarely used it in public. His initials became closely associated with his fiction, Christian apologetics, literary criticism, and children’s writing.

Lewis later taught at Oxford and Cambridge, but his identity as an author was established under the abbreviated name C.S. Lewis rather than his full given name.