Lowes, Fitzgibbons and Quirk

I am hoping someone can help me fing my connections in Ireland. My 2times great grandmother, Adelaide Elizabeth Alexandrina Fitzgibbon was born to Michael Fitzgibbon and Anastasia Quirk in 1839, Adelaide South Australia just on their arrival from Ireland.

Michael and Anastasia married on 6 Aug 1838 in the  Llanrug Parish Church, Caernarvonshire, Wales presumably on their journey. Family lore says that Anastasia's family  were not happy about this marriage. On their Marriage certificate Anastasia's Father is Matthew Quirk, clerk, and Michaels Father is Patrick, servant.

On their application for emmigration 1839 Michael is 24 and Anastasia is 25.

The only other information comes in the obituary for  Adelaide which Anastasia put in the newspaper here in Sth Aust:

"Eldest daughter of Anastasia and late Michael Fitzgibbon, grandaughter of the late Matthew Quirk, Esq.,Spa, Clonmel, Ireland, and great-grandaughter of Late Sir Hammy Low, Fethard, near Clonmel." I dont think Hamilton Low (Lowe) was a sir.

On their sons death notice she put in the information that Michael was from Charnaville (Charleville?), County Limerick and herself was of Spa House, County Waterford, near Clonmel.

 Anastasia buried her son in a Catholic cemetery as she was herself.

Michael and Anastasia had children named: Adelaide Eliz Alexandrina, Eliazabeth, William and Mary Ann.

This is all the information I have on Michael and Anastasia and although quite a lot ,it misses out the genertion before, especially on Anastasia's side.

Thanks Judy