Note that the following directory is a "work in progress".
1 Belgrave Road - Nathaniel Colgan (Amateur Naturalist who classified plants used as "shamrock" in the 1890s.)
3 Belgrave Road - Patrick Joseph Plunkett (c1821-1919) (also 14 Palmerston Road)
9 Belgrave Road - Kathleen Lynn (also Madeleine ffrench-Mullen)
36 Belgrave Road - Alexander Keyes - see 1911 census and various web pages and articles including this one from which we can identify this as one and the same person as is recorded as "Alexander Keys" in the 1901 census. (The discrepancy in spelling between the 1901 and 1911 census records fits well with the narrative of errors relating to the real and fictional characters!)
5 Castlewood Avenue - Artists, William Osborne (1823-1901) and his son Walter Osborne (1859-1903)
23 Castlewood Avenue - James Joyce (as a small child - 1884-1887 - for a list of many the many addresses of his childhood and youth in Dublin see here)
63 Moyne Road - Madeleine ffrench-Mullen
14 Palmerston Road - Patrick Joseph Plunkett
30 Palmerston Road - Garrett FitzGerald
2 Oakley Road - Maud Joynt
29 Oakley Road - Thomas MacDonagh
44 Oakley Road - Áine Ceannt
37* Ormond Road Ambrose Bury (*The house numbers in the 1901 census do not reflect the road house numbers)