When Charles Joseph O'Sullivan was born in 1926, in Marysville, Frontenac Islands Township, Frontenac, Ontario, Canada, his father, Joseph O'Sullivan, was 40 and his mother, Eleanor Loretta Hallinan, was 24. He died in 1981, at the age of 55.
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 .