Translation according to P. W. Joyce:
Ballynanulty in Galway ; Baile-na-nÚllach, the town of the Ulstermen : n prefixed to U : see p. 4, IX [reproduced below].
IX. Under a similar law n is often prefixed to an initial vowel. Ballynana (accented on last syll.), in Kerry, is anglicised from Baile-na-náth (pronounced Ballynanaw), the townland of the aths or fords. See Ath [reproduced below].
Ath, the Irish word for a ford, sometimes written in anglicised names, as it stands, and pronounced accordingly. Genitive commonly atha, but sometimes aith. See A [reproduced below].
A and Ah, at the beginning of names and often elsewhere, represent, both in sound and meaning, the Irish ath, a ford.