While I am not connected (to my knowledge) to the following Farrelly family, I noted your interest in the name Dympna. I copied the following inscription, during a visit in 1978. I have source listed as " Tombstone, Tyholland Chapel, Killyneil Cross Roads, Co. Monaghan". The plot was south of the Chapel in an enclosure which also contained McMahons (although I did not transcribe any of those). "In loving memory of Thomas Farrelly, Growey, died 22nd March 1946; his daughter Dympna died 13th Nov. 1939; son James died 18th May 1968; also his wife Annie died 5th Jan 1976".