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Seán is the Irish form of John, itself derived from the Hebrew name Yohanan, meaning God is gracious. It entered Ireland through the Anglo-Norman form Jehan during the medieval period and became thoroughly naturalized as a distinctly Irish name. Notable bearers include Seán Lemass, a prominent Irish Taoiseach of the twentieth century. Closely related forms include Shane and Shawn, both anglicizations of the same name, as well as the Scottish Gaelic cognate Iain and the Welsh Siôn.