Oh, come on Catters, we can do better than this! What about the great Elizabeth Cronin of Macroom, Co. Cork who sang 'Lord Randal' and 'Lord Gregory'(the latter an awesome performance that every folkie should hear)? Thomas Moran of of Mohill, Co. Leitrim who sang 'The Elfin Knight', 'Lord Randal', 'The Cruel Mother', 'Lord Bateman', 'Barbara Allen' and 'The Farmer's Curst Wife'. Paddy Doran of Belfast who sang 'The Gypsy Laddie' and Mary Connors of the same city who sang 'Our Goodman'. All of these (and a few more) are on the Topic Lps 'The Folk Songs of Britain' vols 4 & 5 (12T160 & 12T161).
More readily available, these days, are the CDs in the Topic 20 vol set, 'The Voice of the People'. A couple of these are devoted to ballads (vols 3. & 17.) and a number of Irish singers are featured. There are probably more featured in the series - but I'll leave you to go through them.