Friedman is a German based name, however most often Jewish German names ending with “man” usually do so with one “n”, while non-Jewish German names ending in “man” usually do so with two nn’s or “mann”. I believe Mr. Friedman is Jewish as the spelling of his name also implies. Usually is the operative word.
Then again, there's Daniel Friedmann, former Israeli Minister of Justice. :)
Friedman is very Jewish, from the Minneapolis suburb of St. Louis Park AKA ‘Saint Jewish Park’. His own mother rued his anti-American and anti-Israel screeds. His father was blessed with dying young so he didn’t have to witness his son’s meshuggas. Friedman, quite logically, has gone from Israel-hate to Jew-(self)hate.