The other day I heard a very brief clip on the radio where some guy claimed that the word "pilot" is derived from the name Jean-François Pilâtre de Rozier, who was one of the men who made the first hot-air balloon flight. That just struck me as ludicrous--the first hot-air balloon flights were in the early 1700s, but I know that the word "pilot" was used in nautical speech a lot earlier than that. Fortunately, m-w.com backs up my suspicion.