Hi Rod.

the 'Druid' name seems to be more a name given to those men and women who study Celtic mysticism, philosophy, etc. rather than one they gave themselves.
'Eisteddfod' is a great word, I now know it's Welsh, it sounded more nordic to me.
The only Welsh word that came to mind was 'flummery', which is some kind of pudding, but is used in English to mean nonsensical language or just nonsense in general.
for examples see this excellent link:
http://www.oreilly.com/people/staff/sierra/flum/

Since visiting Wales, (because I happened to be in Bristol) 'bout 5 years ago I often use one word I picked up there:
toiledau = toilet