One interesting side effect of the Great Vowel Shift occurred when the word Uisce Beatha (Whisk(e)y) was anglicized twice. It was first brought in during the Elizabethan period from Ireland as "Whiskey" and later re-brought in as "Whisky" in Scotland. I've often wondered if that is the same reason behind surname anglicization of Ceallaigh to "Kelley" and later "Kelly".