Surnames McDuff/McKilduff/McKelduff/M'Kilduff/McAlduff

Hi, I am following-up on a lead on my great-great-great-great-grandfather Hugh McDuff/McKilduff/McKelduff. I have reason to beleive he may have beenTermonmaguirk Parish (born ca. 1791). He married a woman named Margaret. His children were Hugh, Hannah Jane (married name Bradley), James, Daniel and Patrick. They immigrated to Pawtucket, RI, USA and he passed on May 28, 1856. I'm looking to try to corroborate the information. In the USA, the surname was McDuff; however, I have reason to believe that alternate spellings may by McKilDuff, McElduff, M'Kilduff or McAlduff. I tried posting to the Tyrone community but no such luck. I did do an Ancestry.com DNA test which suggested some roots in Munster, Dingle Peninsula, North Kerry & Cork and the West Dingle Peninsula.

Thank you in advance for any assistance. Kindsest regards, Jason Alexandre