Searching for Ancestors

Hello folks, 

I am searching for any information on Cornelius Hickey's burial (or any other information on him). Unfortunately, we have search through everything such as speaking to our distant cousins, genealogy websites, etc. but we are constantly hitting a brick wall here. It was very recently that we have heard from someone that he may be buried in Castlehyde Cemetery (I am not sure where it is). Would someone know where or who I can contact about this? Is it possible that there is a list of of surnames available? 

Here are some information that we have on Cornelius Hickey:

birth and death dates are unknown (we don't even know his parents) 

married Bridget Barry on 23 Feb 1823 in Lismore, Co. Waterford 

He may have resided in Ballyporeen, Co. Tipperary 

Father of six children: Thomas, David, Cornelius, Maurice, Margaret and Catherine (all but one child emigrated to North America -  Margaret stayed in Ireland where she married Patrick Drislane and raised their family in Ballyporeen)

I know it is a very long shot but any help would be great! 

Thank you very much, 

Jordyn