Sir Arthur Conan Doyle.

Sir Arthur Ignatius Conan Doyle DL (22 May 1859 – 7 July 1930) was a Scottish physician and writer who is most noted for his fictional stories about the detective Sherlock Holmes, which are generally considered milestones in the field of crime fiction. He is also known for writing the fictional adventures of a second character he invented, Professor Challenger, and for popularising the mystery of the Mary Celeste. He was a prolific writer whose other works include fantasy and science fiction stories, plays, romances, poetry, non-fiction, and historical novels. Although Doyle is often referred to as "Conan Doyle", whether this should be considered a compound surname is uncertain. The entry in which his baptism is recorded in the register of St Mary's Cathedral, Edinburgh, gives "Arthur Ignatius Conan" as his Christian names, and simply "Doyle" as his surname. It also names Michael Conan as his godfather.The cataloguers of the British Library and the Library of Congress treat "Doyle" alone as his surname. Steven Doyle, editor of the Baker Street Journal, has written "Conan was Arthur's middle name. Shortly after he graduated from high school he began using Conan as a sort of surname. But technically his last name is simply "Doyle". When knighted he was gazetted as Doyle, not under the compound Conan Doyle. Nevertheless, the actual use of a compound surname is demonstrated by the fact that Doyle's second wife was known as "Jean Conan Doyle" rather than "Jean Doyle".