Guy is such an old name (Guy of Gisborne anyone?) that a well-read person like Mark must say "Guyus" - the latin variant so to say. He also says "Guy" (Gee) when in France, calls Richard Rocking Ricardo, says Jimbo to Jim Cox, Matty to Matt Rollings and so on.. It did not take long that Ian Thomas became Ianto, didn't it? I am sure that was Mark's idea, too. it all started with the 96ers, in early DS days he was not relaxed enough to do it. I don't think Guyus has any other meaning than just one syllable more. What other nickname would you give a person called Guy?
LE