Hi Rita,
St. Agatha's is a Catholic parish and not a civil parish, which is why you do not see it listed. St. Agatha's is on North William Street, Dublin: http://www.stagathasparish.ie/ This is in the civil parish of St. Thomas. Please post your message here: http://www.irelandxo.com/group/st-thomas-dublin
There are Roman Catholic church records available for St. Agatha's. These date from 1852 for baptismal records and 1853 for marriage records. You can find these at the National Library of Ireland, Pos. 6611. I also found them listed here: http://churchrecords.irishgenealogy.ie/churchrecords/search.jsp?namefm=edward&namel=o%27malley&location=dublin&dd=&mm=&yy=&submit=Search If you have any difficulty, you could try writing to the parish priest for more assistance.
You can find a list of names for Kilbarrack cemetery here: http://www.interment.net/data/ireland/dublin/kilbarrack/index.htm
You could also try checking the land records called the Tithe Applotment Books (1823-38) or the later Griffith's Valuation (1848-64). Griffith's is freely available here: www.askaboutireland.com or here: www.failteromhat.com Failte Romhat has lots of other useful links you could try looking at. Tithe Applotment Books (1823-38). Microfilm copies of the books for all of Ireland are available at the National Archives of Ireland (NAI) http://www.nationalarchives.ie/genealogy1/genealogy-records/tithe-applotment-books-and-the-primary-griffith-valuation/ or the Church of Latter Day Saints (LDS).
Civil registration records are available from the General Register Office (GRO). These start from 1864 however. You can access the website here: http://www.groireland.ie/research.htm
You can information about the frequency of the name in the mid-19th century and any other variant spellings of the name here: http://www.irishtimes.com/ancestor/surname/
Please make sure you link anyone else in your family who is interested in their Irish heritage to our site - and indeed anyone else you know of Irish heritage.
Kind regards,
Sinead Cooney
Genealogist (Ireland XO)
