In New Zealand the name has been anglicised to one syllable, "hare". But it seems that in Ireland it was (and is) given two syllables with the accent on the first - "HAIR-her" .
A famous Irish sporting commentator, Michael O'Hehir, was invariably presented as "MEE-hawl oh-HAIR-her".
(N.B. In vocalising the "HAIR" syllable, leave out the "R" -- I simply cannot access with my keyboard the ordinary symbol for the phonetic indication of a short "e" !!)
Hope this helps.