Suspect that Robert McCahon only came to Culnaman around the time of his marriage or shortly before, possibly to work. There are no McCahons listed in Griffith's Valuation (1859) in the townland of Culnaman. There was a George McCahon bapt. 1851 (no age given) from Ballylame (south of Garvagh) in Main St. Presbyterian Church, son of a Robert McCahon.