Hi
The only surviving Baptismal register for Iskaheen is from 1858 so there will be no records for the dates you have.
My grandmother's cousin married Thomas Donaghey in 1933, he was from Quigley's Point and his father was also called Thomas.
I do know of someone who I helped recently with this line, if you wish to make contact with him let me know.
Irisheyes