Might be nothing, but note that one of the witnesses to the marriage of Edward McCann and Teresa Hamill in St. Peter's RC Church Belfast on 15 July 1871 was an
Anne Cambridge, a name that wouldn't have been too thick on the ground generally across the years (eg. search the later 1901 & 1911 Ireland censuses for a sense of how relatively uncommon).
Fast forward 10 years, to 14 July 1881 - again in St. Peter's RC Church Belfast - when a Patrick McCann married Mary Hughes. While I can't see a civil registration for this marriage, a transcript of the church record gives Patrick's parents as George and Mary McCann and a comment further states that his parents were from County Armagh. Interestingly, one of the witnesses was an
Anne Cambridge.
Dispensation was sought / given, Mary Hughes' parents' names weren't listed but stated to be from Portadown, County Armagh, the address given for both bride and groom was 13 Hatton Street (?) Belfast and the other witness was a Michael Barry.
There are a number of Drumcree RC parish baptisms for parents called George McCann and Mary Lappin, including this one for a son Patrick on 8 July 1847 (right page, near bottom):
https://registers.nli.ie/registers/vtls000632568#page/20/mode/1upOther baptisms include George in 1850, Rose in 1852, Elizabeth in 1855, but I can't see one for an Edward.