I looked at my notes for Peter's baptism last night and saw that this was carried out at St Cuthbert, Cowpen on 15 November 1874 and not St Robert.
I have brother Robert born 23 July 1871 but belatedly baptised at St Robert, Morpeth on 11 May 1896.
Brother William is down as born 14 February 1880 and baptised 25 March 1880 at St Bede, Bedlington.
Joseph Michael born 15 November 1882 and baptised 31 December 1882 at St Bede, Bedlington.
Mark Conroy baptised 1 June 1873, St Cuthbert Cowpen but sadly appears to have died in 1880 aged only 7.
In 1891, I have noted that William, Joseph, and Thomas were all in Morpeth Union workhouse, sadly.
I also see that by 1891 Elspeth was married to Edward Simm and also had Robert Conroy age 20 living in her household where she was living at Pegswood.
Brother Edward married Margaret Gallagher on 24 August 1889 at St Robert, Morpeth. Father's Joseph Conroy and John Gallagher.
I see that one of their children 'Helena' born 3 January 1908 and baptised 11 January 1908 had a sponsor (Godparent 'Helena Rooney') who will presumably be the Ellen you have mentioned.
Another child, Margaret Theresa born 16 January 1900 baptised at St Robert had Godparents James Conroy and Bridget Gilboy. I suspect Bridget (married to James Gilboy) was the daughter of Peter and Ann Conroy nee Miller. Before Ann married Peter she had been married to Daniel McBride and I believe before that she had been using the alias name of Smith.
I will stop here with the Conroy baptisms etc as otherwise this post will run over long .. I have tried to keep brief but seem to have ran on a bit anyway
I definitely agree with you, by the way, about how frustrating it is that our ancestors kept repeating the names.