Coat of Arms: Gold with a green and black base and two red lions supporting a hand holding a sword on which there is an entwined serpent, at the left base there is a gold stag and in the right base there is a wild boar counterchanged silver and black.
Crest: A robin with a sprig of laurel emerging from a crown.
Motto: Lamh foisdineach an nachter
Motto Translated: Lamh foisdineach an nachter
Spelling variations include: O'Sullivan, Sullivan, and others.
First found in in county Tipperary.
Some of the first settlers of this name or some of its variants were: Andrew, Arthur, Daniel, Denis, John, Michael, Patrick, Simon, Timothy and William O'Sullivan all arrived in Philadelphia between 1840 and 1860; Anne, Bridget, Cornelius, Daniel, Denis, Ellen, James, Jeremiah, John, Julia, Mary, Owen, Patrick, Terence and William Sullivan all arrived and others.
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