name McGuinn revealed spelling variations , including O'Quinn, Quin, Quinn, Quine, MacQuin, MacQuinn, McQuin, McQuinn, MacCuin, Cuinn, Cuin and many more. First found in county Longford where they were Lords of Muintir Gillagain. The O'Quinns and MacQuinns (and all of the spelling variables derived from these) were descended from Conn, who