Ó Faracháin
Ó FARACHÁIN—I—O Farraghan, O Farrohan, O Farhan, O Farran, O Faran, Farran, Farron, Farren, Faran, Forran, &c.; probably for Ó hAracháin, 'descendant of Arachán,' the initial f being intrusive; a Donegal surname.
Alphabetical Index to Irish Surnames