I just found out that John Daly was a silversmith this week, so it pulls a lot of things together. I haven't connected the Mack's and the Daly's, but the name is familiar, I just can't remember why. Here is a good site showing there were Gilbert silversmiths in Dublin. I believe the Gray's were connected too.
https://www.silvermakersmarks.co.uk/Makers/Dublin-FI.html#G Here is another good site. Search by silversmith and Gilbert and you will see three. My comment that the Gilbert's were silversmith's in London since the 1600s stems from a newspaper article that references a Charles Gilbert being charged for shortchanging a customer. Silversmith is a specialized field, so we are lucky from a research perspective. But, naturally, they also tended to be pawnbrokers, so its not unusual that there were disputes.
https://www.londonlives.org/index.jsp