I don't think the availability for online information about Carlow has changedf much. The on line telephone directory does show 4 Hade's still living in Tullow, Carlow and 1 in Palantine Village, Palantine, Carlow. With only 4 I would write them all explaining what you know and what you would like to know. The addresses given are sufficient for mail delivery and no postal codes required.
Arthur Hade 188l Surveyor 28 Dublin St. Carlow
William P Hade 1894 Civil Engineer, 28 Dublin St. Carlow
Annette Code