I got this list of name variants from the rootsireland.ie online database. It is imposing. However, if you enter any of the variants, the database searches and responds with ALL variants matching this and other criteria you have entered.
The database has extensive FREE search features. Once you have narrowed the number of possibilities to (hopefully) just one, then you can view the detailed record(s). The detailed view requires a payment of 5 Euros (about US$ 7.00 roughly the price of two gallons of fuel).