We may have a connection. My grandmother, Margaret Stack, later Donnelly, was born in Tarbert, Kerry. Her father's name was Gerald, mother was Catherine Goulding. She had a brother Thomas Stack. She was born Nov 26, 1886 and emigrated to NY on Oct 24, 1908. She later married Francis Donnelly and lived in Little Falls, NY. There is a Thomas Stack still living (very elderly) in Little Falls that is the son of her brother.
I would be interested in any other information you may have.