Hej hej!
Thing is that I've come across references (although I can't remember where - duh!) to
Erin meaning "peace" as well - tracing it through its Gaelic roots. This is the reason I'm asking, but if no one's heard of such a root, I'm guessing my memory is either failing me or the place(s) I've read this are simply in the wrong.
And since I don't know of any Swedish name day names that mean "western island" I guess
Irene will be as good a day as any and better than most!