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It is possible that post 1798 Wexford Sly's moved across the border to Carlow. Walter Sly and his brother (Archibald if my memory serves) lived near where present day Sly's live in Carlow. One of the brothers  also had a connection with old Leighlin. There is a record of a William Sly in the Yeomany Returns detailing his pay and his signature for said payment. "The government paid the Yeomanry for their service. In 1798, about 50,000 members of the Yeomanry fought alongside the British Militia. Their ranks included a mix of Church of Ireland members, Catholics, and Presbyterians." In the Carlow Returns the commanding officers of the individual troops for different locations in the County were mostly well known Protestant landowners see https://www.igp-web.com/Carlow/1798_and_Carlow_08.htm
The Yeomany Returns shows a significant number of Irish surnames, at one stage Catholics were originally excluded from the Yeomany I cannot remember the year but at some time before 1798 it was agreed that trustworthy Catholics could join.

Sly Edward, of Blackstoop, Farmer, murdered at Enniscorthy, 28th May 1798, Parish of Enniscorthy

Sly, William, all of St. Mary’s and all murdered on Vinegar Hill*.

Slye, Edward, Shop-Keeper, murdered at Enniscorthy, 28th May 1798, of St. Mary’s Parish.

HI Paul,
I am a retired Carlow Purcell, currently living in Scotland. I am particularly interested in your St Mullin's Purcells as part of some research I have been conducting. I found the marriage record for your John Purcell and Mary Flemming, marriage date what looks like 15th May 1862 residence given as Drummond, St Mullins. Coincidently I also have Slaters in my line but it is likely just coincidence. My interest is in a Patrick Purcell listed in the Tithe Applotment Books as occupying land in Knockshawn townland in St Mullins occupying 1 acre 2 roods 19 perches. Patrick may be the father of aforementioned John Purcell. Have you taken DNA test with Ancestry or Myheritage or FTDNA?
James M A Purcell (aka Tony)