Another version of the tale:
The phrase luck of the Irish is commonly thought to mean “extreme good fortune.” However, according to Edward T. O’Donnell, an Associate Professor of History at Holy Cross College and author of 1001 Things Everyone Should Know About Irish American History, the term has not an Irish origin but “a happier, if not altogether positive,” American one.
“During the gold and silver rush years in the second half of the 19th century, a number of the most famous and successful miners were of Irish and Irish American birth. . . .Over time this association of the Irish with mining fortunes led to the expression ‘luck of the Irish.’ Of course, it carried with it a certain tone of derision, as if to say, only by sheer luck, as opposed to brains, could these fools succeed.”