I've compiled this:
• Scotch- Irish stock according to biography, but census info shows no “off-the-boat” Irish as far back as 8 generations at which point there is no further info
Source: The gentleman from Georgia: the biography of Newt Gingrich
• Mother is half-Irish and half-Italian (source wiki)
• But he claims Italian roots exclusively
• His great grandmother, Margaret Dumont is Irish, landed in New York, worked as a house keeper.
Please challenge anything I've stated, or add more if possible