Hi Catherine
Origins of the name, I assume that you mean Brophy!
Ua Broithe Gaelic Sept in Osraighe (12th Century) of Mag Sedna, like many Gaelic names it was anglicized to O'Brophy, Brophy or Brophey, so roughly speaking Brophy is a clan name from around the Laois/ Kilkenny border. Ballybrophy would have been where the clan chief settled. Ballybrophy is south of Borris-in-Ossory (N7 Dublin to Limerick Road) SW of Castletown.
Castletown is a very pretty village that has won Tidy Town awards (a bit ike Britain in Bloom). The castle is a ruin once owned by the Macgillycuddypatrick's (later ordered by James 1 to change their name to Fitzpatrick) some sort of princes, whom the Brophy's came under.
Castletown is quite a large parish (Offerlane Civil Parish) in that there asre many townlands ie a few fields given a name (doesn't even have to have a dwelling on it) or it can be several farms. (Townlands can only be seen on Ordnance Survey maps)
In the 1850 Griffiths Valuations there are
3 Brophy heads around Castletown Roger Richard and Mary'
further afield in the parish Martin, Andrew, Patrick, William Joseph,George, Edward, Thomas Timothy and Patrick, Michael and 2 Mary's 16 tenants in all that doesn't count any sublets (though the famine probably sorted that out).
The Catholic church was forbidden to keep records1695-1728 catholics lost civil rights and it took years to get them back
In 1829 Catholics were allowed to practise their faith without persecution many of the records started then. It looks like your Margaret could be your brickwall.
President Kennedy could only go back to 1840!!!!!!!!
Irish naming pattern The first son named after the Father's father the second son was usually named fter the Mother's Father The first daughter after the Mother's mother.2nd daughter after the father's mother, then they go onto fathers names eldest sister etc. Your Margaret could be my James Elder sister
The FHC will do searches for a fee, but your records go back further than their's.
It's my belief that all Brophy's are related DNA wise, just cant prove it.
I hope this help's, passed an evening away
Go to Ireland anyway, it's so different
All the best Anne