Hi, It depends on what side of the river you live on.
If you have a look at the map of Clonmel and zoom in you will see the boundary line.
When searching, ..... Tithe then Griffiths Valuation, Parish names changed. Most churches were allowed to be re-built around the 1830's.
In the Tithes if you know the townland just put that in and not the county.
Also they drop the O' in a name.
If it is a not so common surname and a not so common Christian name, put the first 3 letters and a * and it will show all.
Some are in as eg. John can be Jno ......Michael came be Michl or Mick.
It depends on the year you have available for your search.
My tip is......work backwards.
Hope this helps