Re: Prunty's in longford or US
Per the Italian Genealogical Group online database of vital records for Brooklyn:
Peter Prunty married Margaret Prunty 11 Jun 1933 in
Brooklyn, Kings County New York.
Based on what you said, their 1st son would be Peter - not uncommon for that son to take his Grandmothers maiden name as his middle name = Reilly.Peter Reilly Prunty.??