I looked up Griffiths Valuation for you.
This is a valuation taken in 1855.
There is a Brien Kenny listed in the townland of
Carrigeenagowna, Barony/Union/Parish Boyle.
I also looked at the Tithe Applotment dated 1833
there is a Bryan T.P. Kenny in the townland of
In general Irish Records are not great, as a lot were destroyed. But you might try the Parish Records to see if they have a marriage for Bryan.
Hope this is of help to you. Best of luck with your search.