Walton here is of Anglo Irish stock & would qualify as an Ulster. Since when are Ulsters considered Irish?
Even if one considers him that translates to 1.5 ppl out of an estimated 80-100 million ppl of Irish descent.
Exceptions that prove the rule.
I've also given you the example of Anthony Quinn of Irish Mexican heritage. His father was from Ireland. Quinn went on to write in his autobiography that his love for art music & architecture stemmed from his Mexican genes & that if he were fully Irish he'd be no better than an animal - someone who drank excessively, brawled incessantly ate immoderately & got laid whenever he felt like with whomever he felt like ( the only saving grace here was that he was a womanizer & not a fag or into bestiality) .