It appears that the location variously given as Griddle/Gridle/Grid in the Ballymore/Mayglass parish registers corresponds to Randalstown, Co. Wexford, a townland just south of Mayglass. I determined this by following up on a suggestion on another board to crosscheck the names given for "Griddle" with those listed in Griffith's valuation.
I guess this should not be a surprise, as I already knew that the Walsh family of interest lived in Randalstown in 1852/53 (Griffith's Valuation), and 1860s (civil registration records).
The name Griddle/Grid may come from the layout of the farm strips there at one time. The grid arrangement changed over time and disappeared (using various historical layers on the wonderful AskIreland site).
