My Whelton ancestors are from county Cork and I never could find them in Ireland..I did find my McCarthy ancestors from County Kerry which surprised me...McCarthy being such a common name.
At any rate, here is the URL for my information about my Horrigan ancestors: http://freepages.genealogy.rootsweb.ancestry.com/~sanf/
I haven't updated it for a while, but then I haven't been working on my ancestors for a while!!
All the best,