that is still a possibility that he came from Dingle.
I have no way of knowing that.
I am just going on what is on the LDS sitewww.familysearch.org
because there are so many records for that name and they are from the Castleisland area.
Castleisland is covered very well record wise, because that parish is included in the Casey Collection.
and the LDS microfilmed the Casey Collection with all of the parishes that Casey indexed.
Dingle was not one of those parishes, so that is why you will see lots of Castleisland records, Killarney/Kilcummin/Rathmore/Ardfert records, but very few for Dingle area before 1864.
Another way to search the LDS site is to go to the IGI section
type in last name only.
Prendiville, pick region British Isles, then Ireland.
Do not choose a county.
Leave that box as (all counties)
this method will show you all the Prendiville records on the LDS site, for ALL of Ireland.
A bit time consuming to go through all the different counties,
to find the Kerry ones, but a great way to find every record for the surname.
Good luck with your search