Looking for Information on John James Casey Married Theresa Mary Pagon

I believe John James Casey was my great great grandfather (born Co Clare Ireland). He was draper in Wellington NZ. Married Theresa Mary Pagon ? had a son John Joseph Casey born Wellington 1876 (married Maud Mary Urwin aka Eliza Maud). I am a descendent from that line. John James parents listed on death certificate as James Casey and Mary Elizabeth O'Dwyer. Any information greatly appreciated.