What was C.S. Lewis's middle name?

C.S. Lewis's middle name was Staples.

His full name was Clive Staples Lewis. He was born in Belfast in 1898 and later became known worldwide by his initials, C.S. Lewis, rather than by his full first name. “Staples” was his mother’s maiden name, making it a family name as well as his middle name.

Lewis is sometimes confused with other British writers whose names begin with C.S., or with his friend J.R.R. Tolkien. The two men belonged to the same Oxford literary circle, but Lewis’s name was Clive Staples Lewis and Tolkien’s was John Ronald Reuel Tolkien.

Lewis wrote fiction, literary criticism, Christian apologetics, autobiography, and poetry. His best-known fictional works include The Chronicles of Narnia and the Space Trilogy. Knowing his full name also helps distinguish him from the American poet and critic C.S. Lewis, who is not the same person.