O'Leary is a surname of Irish origin, commonly associated with the Gaelic name Ó Laoghaire, which means "descendant of Laoghaire." The name is prevalent in Ireland and among Irish communities worldwide. It is often linked to various historical figures and families in Irish history. In addition to being a surname, O'Leary can refer to several notable individuals, including Kevin O'Leary, a Canadian businessman and television personality known for his role on the show Shark Tank. The name may also appear in place names and businesses, reflecting its cultural significance.