Mac Aodhagáin (English: Egan or Keegan), is an Irish Gaelic clan of Brehons who were hereditary lawyers - firstly to the Ó Conchobhair Kings of Connacht, and later to the Burkes of Clanricarde.
[1][2] The earliest surviving Irish law manuscript, In Senchas Már, was written prior to 1350 at a school (patronised by the Mac Aodhagáin) at Duniry, near Loughrea.
[1] Other branches of the clann maintained schools at Park, outside Tuam, and at Ballymacegan in Co.
[3] The surname has been Anglicised in a variety of ways, including as Mac Egan, Egan, Eagan, Keegan,[4] Keeghan, McKeegan, or Keigan, McKiegan, and McKagan.
[citation needed] People with the surnames of "Egan" and "Keegan"- their descent from the Mac Aodhagáin not in all cases established- include: