When Dermod O'Sullivan was born in 1536, in Munster, Ireland, his father, Lord Beare Dermod O'Sullivan Mor, was 57 and his mother, Lady Julia MacCarthy, was 27. He died in 1627, in Spain, at the age of 91.
Some characteristic forenames: Irish Brendan, Donal, Liam, Siobhan, Declan, Kieran, Cathal, Dermot, Eamon, Fergus, Grainne, Seamus.
Irish (Munster): Anglicized form of Gaelic Ó Súileabháin ‘descendant of Súileabhán’, a personal name from súil ‘eye’ + dubh ‘dark’ + the diminutive suffix -án. Compare Sullivan .