Which fictional author name did C.S. Lewis use for his early poetry?

C.S. Lewis used the pen name Clive Hamilton for his early poetry.

Lewis published Spirits in Bondage in 1919 under the name Clive Hamilton. The collection appeared while he was still a young writer, and its title reflects the darker, more skeptical outlook associated with his early poetry. He used the same pseudonym for Dymer, a narrative poem published in 1926.

The name was not his birth name. Lewis was born Clive Staples Lewis, and “Clive Hamilton” combined his first name with a surname connected to his family history. Later, he became widely known by the initials C.S. Lewis rather than by the pseudonym used on these early poetic works.

Lewis’s literary reputation eventually rested more heavily on fiction, literary criticism, Christian apologetics, and children’s fantasy. The early books nevertheless document a distinct stage in his development as a writer before his conversion to Christianity and his later public career.