O'Sullivan is a surname of Irish origin, commonly associated with the Gaelic name Ó Súileabháin, which means "descendant of Súileabhán." This name is prevalent in Ireland, particularly in counties like Cork and Kerry. Many individuals with this surname have made significant contributions in various fields, including sports, politics, and the arts. One of the most notable figures with the surname O'Sullivan is Ronnie O'Sullivan, a professional snooker player widely regarded as one of the greatest in the sport's history. He has won multiple world championships and is known for his exceptional skill and fast-paced playing style. O'Sullivan's influence has helped popularize snooker globally.