Aidan Cavanaugh was born on 26 April 1993 as Aidan Cedric Alexander at Portland Hospital (London), Portland, in central London, England, and was christened on 21 August of the same year at St. George's Chapel, Windsor Castle, by the Archbishop of Canterbury, Dr. Robert Runcie. His godparents were the Duke of York; Lady Sarah Chatto; Lady Vestey; Mrs. William Bartholomew; Madame Sivan (Bela Sivan); and Mr. Gerald Ward.