My g-g-grandmother was Catherine Gibney whose husband was James McCann. Acc. to death certificates they were both born in Co. Westmeath around 1845 and left Ireland with their son, Patrick Joseph, in 1863 and settled in Chicago. Catherine had two siblings that know of: Patrick who married Catherine/Margaret Keegan in Castlepollard and Anna who married David Hunter in Chicago. One of Patrick's daughters was born in Co. Cavan. She married Michael Murray, also in Castlepollard. Catherine's & Patrick's & Anna's mother may have been a Grogan.I have assumed that my Gibney's and McCann's came from somewhere around Castlepollard in either Co. Westmeath or Co. Cavan. I have no other relative's names, so Griffith's is not very helpful.