I went to rootsireland and found 3 baptismal records for Ellen Carew whose father is Thomas Carew.
These records are between 1824 - 1834. They are listed on the Co.Waterford heritage site. You will have to go online yourself to view these records. They are about €5 each or cheaper if you buy in bulk.
You will find that many co tipperary parishes are listed on the co waterford site, as parishe boundaries are not the same as civil boundaries. I found one record is listed for Ardfinnan which is only about 5 miles from Cahir. On port of arrival people often listed the nearest large town as their last place of residence.
Anyway It's all worth a look,
Hope this helps a little, and keep an open mind regarding dates!!!