Kildea / Gildea
My wife's great-grandmother was a Margaret Kildea who was born sometime around 1844 in County Galway:
https://www.geni.com/people/Margaret-Mehigan-Kildea/6000000018823628632
Unfortunately, we don't have her marriage records which would give us her father, possibly because it was an army wedding.
Recently, my son did a DNA test and has matches with to different families that have Kildea / Gildea ancestry from Galway:
* Michael Gildea born November 25th, 1843; his sister Mary born October 3rd, 1934; their sister Brigid born November 9th, 1937; all born in Derrygoolin, Woodford. Their parents are Thomas Gildea and Catherine Clarke.
* Bridget Annie Maria Kildea/Gildea and her sister Mary born in the 1840s in Galway. Although they don't have records saying where, the wider family is known to come from Wooford. They emigrated to Melbourne in the 1850s.
What we don't know is how these all link up. As the two other families have a Mary they all can't be the children of Thomas and Catherine, but Margaret might fit in there (my son is a stronger match for the first family) or they could all be cousins.
One complicating factor is that the Woodford baptism records seem to be missing between 1843 an 1851 (the period some of these births would fall into) and only starts in 1823 (so we'd not catch the birth of the parents - the marriage records are missing from 1833 to 1851, so we can't even pick the parents up there):
http://registers.nli.ie/parishes/0340
The interesting thing is that Margaret is the source of wife and sons' mitochondrial DNA. So if we could establish the line of direct female descent from the other Kildeas it might be that we could test the various hypotheses. However, manage to find those links and being able to test them is tricky.
Anyway, while we are working on that, I thought I'd throw this in, as there might be other records or gravestones or something that might help bridge the missing information.