I get the feeling we are working with the same families but how they are connected I don't know!
Yes I have a record of a Felix McGarry and a Mary Crory (? not too sure of this) having children including a Sarah 1836 and a Felix 1834 or so. This reference is to the Tannaghmore RC church near Randalstown.
Other common names that keep cropping up are Madden, McNally, McAteer, McQuillan.
Hope this might give you some ideas of where Catherine may have come from. A lot of the McGarrys were fishermen on Lough Neagh. Around 1880 there appears to be a large exodus of everyone from the country into Belfast and there are a few McGarrys in Belfast.
