Nicholas Pendergast was from Letterkenny, County Donegal, Ireland. He married, c1847 in Saint John, NB, Mary McCaffrey from Londonderry, Ireland. The family moved to Boston, MA. 
PANB:MC1/Pendergast, 12 pages: Mary McCaffrey had three sisters who also came to Saint John: one married John Fallon and moved to Boston: another married a Mr. Kingsley and went to Iowa.