Gallagher Cup origins?

This request from reader David Slattery:

I was on the net looking for information about the Gallagher Cup, a GAA schoolboy competition in Northern Ireland, and came aceoss your Slugger O’ Toole site.And even though its a long shot, I just thought i would ask you if you could help me out…. I am trying to find out who the Gallagher Cup was named after, cant find much on the net, and the GAA head office dont have a clue, do you have any suggestions as to where I might find the info?