Thanks Wexflyer. 
Yes, I’ve seen the “facts” embellished on certificates numerous times on certifcates.
Wexflyer, is there any way to discover more about this Jeremiah Healy?
Yes, there are three options. And one suggests an alternate scenario. The three options are the parish records, the tythe valuations, for possible father and llocation, and cancelled valuation/rates books.
Now the parish records are extant for both New Ross (from 1789) and Cloughbawn (from 1816, called Killegney on NLI site), but there seems to be no sign of his baptism? So the information we can glean from these seem to suggest that he wasn't originally from either of these parishes - see next point.
Now the tythe valuation would be more interesting if you knew Darby/Jeremiah's father's name [as probably too early for Darby himself]. That said, there is a very interesting entry in the 1825 tythe valuation for Old Ross. Namely, Thomas Healy holding a farm of 10-3-28 Irish acres in the townland of Ballylane.
http://titheapplotmentbooks.nationalarchives.ie/reels/tab//004625707/004625707_00044.pdfDarby's eldest known son was also Thomas, suggesting his father was Thomas. If there is any truth in the family holding a farm, then this is the only one to come up so far in the vicinity of New Ross. Ballylane is in the parish of Cushinstown (Old Ross on NLI), and the parish records go back to the 1700s. Crucially, and unfortunately, however, there is a gap from 1830 to 1851 - precisely when we might expect Darby was born. So, this is a credible (but again not certain) possible origin for him. Note that there is no Healy in the townland in Griffith's Valuation in 1853, so gone by then.
The third source of possible information on Darby are the cancelled Valuation Office books (rate books). He should be in them, which would show where he lived in New Ross, and when he dissappeared from the books would show when he died or emigrated.
