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It's not clear what you seek, but I'll do my best to help.
Killorglin is a parish of its own, not part of Ardfert or Duagh.
I queried Cornelius Gearin in Killorglin on The Church Records area of irishgenealogy.ie.
The results can be viewed at this link.
In many of these records he is either a sponsor in a baptism or a witness to a wedding.
In the Griffith Valuation in 1853 Cornelius appears the Townland of Tinnahally:
I hope this gives you some leads!