Quilliam is a surname of Manx origin, meaning "William's son", and may refer to: John Quilliam, a British Royal Navy officer and the First Lieutenant on HMS Victory at the Battle of Trafalgar Peter Quilliam, a New Zealand lawyer Peter Quilliam, a British pharmacologist Susan Quilliam, an agony aunt and author noted for bringing systemic psychology to a mass audience Wayne Quilliam, Australian photographer William Abdullah Quilliam, a 19th-century convert from Christianity to Islam, founder of England's first mosque and Islamic centre. Wikipedia