What was the full name of C.S. Lewis, including the initials represented by “C.S.”?

The full name of C.S. Lewis was Clive Staples Lewis.

Lewis was born in Belfast, Ireland, on 29 November 1898. His first name, Clive, was sometimes shortened to “Jack,” a nickname he adopted after childhood experiences with a childhood pet. “C.S.” therefore stood for his first and middle names, Clive Staples.

Lewis became known internationally as a novelist, literary scholar, Christian apologist, and author of children’s fantasy. He used several forms of his name in different settings, including “C.S. Lewis” on his books and “Jack” among friends. His brother, Warren Lewis, was also a writer and helped preserve many details of his life.

The initials can be confused with a pen name, but C.S. Lewis was not a pseudonym. They directly abbreviated his legal name. His best-known works include The Chronicles of Narnia, Mere Christianity, and The Screwtape Letters.