i was told that the drink can only be called whisky (no E) if it is brewed in scotland ,all others must be called whiskey (with an E ) - mind you i was touring a scottish brewery at the time !!
WHISKY is Scotch. Frome the Gaelic meaning "Water of life". WHISKEY is Irish/ American and all the others. Apart from the Welsh which sounds as bad as it tastes.
"Slainte"