<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>
what part of ireland do sullivans come from
what part of ireland do sullivans come from
originally found in County Tipperary
originally found in County Tipperary