Julie, My grgrgrandmother was Margaret McGivern O'Hagan. Her Parents were Michael and mary McGivern who would be from Tanvalley or Tullintanvalley, County Down. Also identify with Danbrige, Ireland. Among many others they had a son Peter who came here sometime after 1911. Peter's DOB was 9/16/1870. He was living in Brooklyn,NY in the 20s and 30s.
If there is anything there let me know at FernNaCrin@aol.com.