some directories listing for the Moran family business (some of these are already mentioned in the other posts) :
1848
13 East Johnson's Court (between Grafton Street and Clarendon St)
Dennis Moran, chimney sweeper
1863
it appears number 12 to 16 Johnsons' Court East are now 'new entrance to Clarendon Street Church', Denis Moran, sweep is now listed at number 5 instead of 13.
Late 1870s there is an Edward Moran, chim. Sweeper at number 5 - maybe a son of Denis ?
1894
Timothy Moran, chimney sweeper, 5 Johnsons court east
1904
Moran & Sons, 51 Oakley Rd, Ranelagh
Timothy Moran, 5 Johnsons court east - chim. sweeper to Trinity College
1914
Timothy Moran, 5 Johnson 's court
1927
Moran & Sons, 5 Johnstons court east - chim. cleaners to Trinity College and Bank of Ireland
Jas. J. Moran, " " chimney cleaners
Denis Moran, 51 Oakley Rd, Ranelagh
1938
same as 1937 listing eadaoin mentioned plus
William Moran, 51 Oakley Rd, Ranelagh (no occupation given... could be his residence)
Moran as sweeps at both addresses in 1949
Shane