Name
- O Caiside, Proinnsias óg1
- O Catháin, Maghnus1
- O Catháin, Séamus, son of Brian and Máire O Catháin1
- O Conehobhair, Toirrdhealbhach, Irish poet1
- O Dochartaigh, Seán, son of Seán O Dochartaigh1
- O Domhnaill, Maghnus1
- O Donnghaile, Pádraig, Irish poet1
- O Dálaigh, Muireadhach Albannach1
- O Dálaigh, Muirgheas, Irish poet1
- O Maoilchonaire?, Seán, mac Flaithrí; Irish poet1
- O Muireadhaigh, Séamus, Dominican friar1
- O Raghallaigh, Maolmórdha, priest, d 16171
- O Ruairc, Ferghal1
- O Ruairc., Tadhg, Irish poet1
- O Ruaire1
- O hEodhusa?, Eochaidh, Irish poet1
- O hUiginn, Tadhg dan, Irish poet1
- O'Dwyer, Edmond, RC1