Yes
today the Irish trace their ancestry to the Celts.
Ya' think? His ancestry was of Scoth-Irish and English ancestry.
English and Irish
English of Irish ancestry
He is of Italian, Irish, Dutch, English, and Swedish ancestry.
His mother was of mixed African and Irish ancestry.
Some people in Newfoundland would have Irish ancestry.
Chick Hafey did have Irish ancestry. The Hafey's were originally from Scotland but migrated to Ireland before coming to America.
While there is no one common ancestry, many of them have Irish ancestry.
Matt Bomer has English, Scottish, Irish, and Welsh ancestry.
YES. However, very few people would qualify as having "Irish Jewish ancestry" in that their ancestors were Jews from Ireland since the Irish Jewish community was never terribly large. (Currently, it boasts 400 members.) More likely, if you find a person who claims "Irish and Jewish ancestry" this is a person who has Jewish ancestry on one side of the family (let's say Polish Jewish ancestry on the mother's side) and Irish ancestry on a different side of the family (let's say Irish Catholic ancestry on the father's side).
No, George Clooney's father is of half Irish, a quarter German and a quarter Anglo-American ancestry; his mother is of Anglo-American ancestry. His aunt, Rosemary Clooney was married to José Ferrer, and Miguel Ferrer is George's cousin, perhaps that's where the confusion arises.