Hi bestdriver,
I have been doing a sort of one-name study on the Quirk(e)s of Dublin City as quite a few of them belong to my family.
Can't find a Joseph born close to 1890 just now but note that there is one on the 1901 census who is the grandson of Ellen Geoghegan.
I think this probably makes him the child registered as Timothy Joseph in 1889. Could this be your Joseph? and, if so, is it possible that he was buried under his full name of Timothy Joseph Quirke?
Timothy Joseph Quirke was the son of John Quirke and Jane Geoghegan, born on 26th April 1889 and baptised at St Michael & St John on 6th May 1889. Their address at that time was 9 George's Place and by 1901 they were at 4 Georges Avenue, but Jane and Ellen were both widows.