I think I may some info of interest to you. Mary Ellen Ahearn, b. 1869, is my great-great grandmother.I know she was born in County Cork in Coolegelah-Canturgh (that's the spelling as it was handed down to me; I am by no means sure it is correct!Keleagh seems to be uncannily close.).
She married James J. Desmond of Weymouth, and died in 1949.They had a son was John Patrick Desmond, 1890-1961.Don't have any info on siblings.
Think there might be a connection? I do, but I don't know any more than what I've just related.
If you have any records or other information that could help me out, I'd appreciate it.