<P> O'Sullivan ( Irish : Ó Súilleabháin ) , also known as simply Sullivan , is an Irish Gaelic clan based most prominently in what is today County Cork and County Kerry . The surname is associated with the southwestern part of Ireland and was originally found in County Tipperary before the Anglo - Norman invasion . It is the third most numerous surname in Ireland . Due to emigration , it is also common in Australia , North America , Britain and the rest of the world . </P>
<P> O'Sullivan ( Irish : Ó Súilleabháin ) , also known as simply Sullivan , is an Irish Gaelic clan based most prominently in what is today County Cork and County Kerry . The surname is associated with the southwestern part of Ireland and was originally found in County Tipperary before the Anglo - Norman invasion . It is the third most numerous surname in Ireland . Due to emigration , it is also common in Australia , North America , Britain and the rest of the world . </P>
where did the last name sullivan come from
where did the last name sullivan come from
an Irish Gaelic clan based most prominently in what is today County Cork and County Kerry
an Irish Gaelic clan based most prominently in what is today County Cork and County Kerry