Other branches of the clan: Creed, Creedan, Creedin, Creeden, MacCridan, MacCredon
Old Irish Clan Name: Mac Críodàn
Modern Irish Clan Name : O Criodan
Associated with: Hempe, McAready, McConneady, McCready, McGreedy, Mecredy, McReady, McReeedy

Both Creedon and Creed are names originating in West County Cork, in the Province of Munster. The Irish form of these names appears in the Elizabethan Fiants (records of pardons granted to Irish citizens for transgressing English Law). The records for County Cork and County Tipperary show the name as MacCredon and MacCridan. In 1564, the name of Donagh MacCrydon, a harper, from County Tipperary appears. The prefix "O" was sometimes used as early as the Sixteenth Century, since the same man's name was written as O'Kredane in a record of 1582.

Inchigeelagh is part of the ancestral home of the OSullivans and forms a stage of the Beara-Breifne Greenway which is based on the historic march of O'Sullivan Beara in 1603.