No, his real last name is Kohn. Has grandfather converted from Judaism to Catholicism, and changed his name to attempt to masquerade as Irish as well. A new twist on "Look British, think Yiddish".
Shades of "The Matchmaker". An Massachusetts "Irish" Senator sends an aide to Ireland to find his roots. Turns out they don't exist, because his roots are really in eastern Europe and his grandfather changed the family name.
Thanks! Even when I am sarcastic about Kerry, it turns out to be true! Amazing!