Harphall townland is in Carnlough, on the coast road and there appears to be a Roman Catholic graveyard there, could that be the one? St John’s Roman Catholic Graveyard. It’s in the parish of Tickmacrevan which seems to link with Hugh. I’m afraid I don’t know the area though though I’ll have driven through it in the past.
The graveyard my grandparents are buried in in often referred to by the name of the townland rather than the church name