Re: surname: kilroy / athlone
Cannot help you directly , but I suggest -
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Visit athlone.ie and click on genealogy for background info on the special aspects of fam hist research in Athlone
Access residential section of telephone directory for the 09064 area - there are about 7 Kilroy entries
Visit familysearch.org and do a kilroy birth search - they have a March 1879 birth that does not match yours
Confirm birth details with Registrar General of Births Marriages and Deaths in Dublin (civil registration began in 1864 so J J K should be there )
Good Luck !