Hi Bill, I am an administrator volunteering for the parish of Bailieborough & Shercock. I looked up the 1901 & 1910 census on nationalarchives.ie & there are whitfield listed in Dung ( most probably Drung, which is in Cootehill) co cavan, this may be your family. There are no whitfields in the current phone book, but a lot of people are unlisted nowadays. I have asked a friend in Cootehill, can he help & if he finds anything, I will let you know. The local paper "Anglo-Celt" is archived online at Irish newsarchive.com, it is a subscription site.
You can also email the Anglo celt & write to the editor, it may provoke a response from the readers.
Graveyards are not fully transcribed & I will keep a eye out for the name when I am visiting graves etc..
Grifiths valuation (free) on askaboutireland.ie also has your family listed, I guess you have that information already.
I googled the name & I see you/your family are other message boards.
Best Wishes in your search. Carmel O'Callaghan