Idris is the Welsh for Arthur, for example "Cadar Idris" is translated into Arthur's chair or seat, a rock on which Arthur is supposed to have sat on in North Wales.
It is actually "Cader Idris", which is why the school nearby is called "Ysgol Y Gader" or School Of Chair. Idris is a wonderful name, full of Welsh pride. My school is close to Cader Idris, but not as close as Gader.
It is the name of a Welsh Giant from mythology. The name was given to a mountain range "Cadre Idris'. The story goes if you spend a night on the mountain (Seat - in translation) you will return a madman or a genius. It is also the name of two prophets in the Holy Koran.