:No, but it's an alternate pronunciation. I assume that the Jeopardy answer was spoken, not written? I also notice that the PBS page is a transcript, and transcribers have to write down a lot of stuff they know nothing about; especially with proper names, they often just make a guess at the spelling. Note that 'Ganymede' is also spelled wrong. From the transcription, I'd guess that guy they were interviewing was trying to recreate the Classical Greek pronunciations. (Each of the moons in Wikipedia is listed with its Greek source, if you want to check it out, although a few are missing stress markings.) The Galilean moons would be pronounced  for Io (Îô), which with an English accent would come out as ee'-oe;  for Europa (Eurôpê);  for Ganymede (Ganymêdês); and  for Callisto (Kallistô). — 2005 July 1 07:11 (UTC)