"Pinkman: Na hOlladha = Cairns or penitential stations. Halls is the English for the Irish plural. As the article causes ‘h’ to be prefixed to the word, this is retained in the English name. The word olaidh, or ulaidh, means a cairn or a tomb, but very early it came to mean a penitential station or place of devotion – that is, a place to which people came to pray and do certain works or penance. Whether the word olaidh in this name is to be understood in its primary significance, as a cairn or a tomb, or as a penitential station, I am unable to say. There is no tradition now that such exercises were ever performed there. "

['mh' ós cionn an 'dh']

'the carns or penitential stations'