Searching for O’Brien living in Merrickville in the 1891 Census, finds Rev. Moyne C. O’Brien, age 36 (born ~1855), Roman Catholic, a clergyman. It looks like Ancestry has misinterpreted his name. Both his parents were born in Ireland.
http://search.ancestry.com/cgi-bin/sse.dll?db=1891Canada&...The RC priest O’Brien, age 32, that died in Belleville, Hastings County on June 7, 1902 was Patrick O’Brien.
http://search.ancestry.com/cgi-bin/sse.dll?indiv=1&db=on...Is a priest given a new Christian name when he is ordained? Might explain why there is no little Morgan.