MacCarthy married Julia, daughter of
Cormac Oge Laidir MacCarthy, 10th Lord of Muskerry. It was his first but her second marriage. She was the widow of
Gerald Fitzmaurice, 15th Baron Kerry, who had died in 1550. Cormac and Julia had two sons: •
Donal na Pipi, became the 17th Prince • Dermond na-Glac MacCarthy —and four daughters: • Catherine, married
John Butler of Kilcash, father of
Walter Butler, 11th Earl of Ormond • Honoria, married her distant cousin Owen MacDonogh MacCarthy, Prince of
Duhallow • Ellinor, married her cousin Dermod MacCarthy of
Enniskean • Ellen, married first in 1572 Sir James FitzGerald, Lord of Decies (died 1581), and secondly
James FitzRichard de Barry, Lord Ibane and 4th
Viscount Buttevant, ancestor of the
Earls of Barrymore. Ellen seems to have been an illegitimate child. After MacCarthy's death his wife would marry thirdly
Edmund Butler, 1st/11th Baron Dunboyne (died 1566) == Death ==