Under the pen name “Clive Hamilton,” C.S. Lewis used Lewis as his surname.
Lewis published two early volumes of poetry under that name: Spirits in Bondage in 1919 and Dymer in 1926. The name combined his first name, Clive, with Hamilton, a family name connected with his mother’s side.
His birth name was Clive Staples Lewis, but he was commonly called Jack by family and friends. The nickname came from a childhood incident involving a dog named Jacksie and eventually became his preferred personal name.
The pen name can cause confusion because Lewis later published major fiction and apologetic works under C.S. Lewis. “Clive Hamilton” therefore belongs mainly to the early poetry phase of his career, not to the Narnia books.