The Septs of Clan Buchanan derive from the first Auselan to use the surname Buchanan, Gilbert, whose father had obtained the Buchanan lands, and his brothers Colman and Methlan, grandson Maurice, and great-grandson Walter. For names spelled with 
Mac also read as 
Mc Bohanan, Bohanon, Bohannan, Bohannon, Buchannan, Buchannon, Buchanon, Buxton*, Colman*, Cormack*, Cousland*, Dewar*, Dove*, Dow*, Dowe, Gibb*, Gibbon*, 
Gibson*, Gilbert, Gilbertson*, Harper*, Harperson*, Leavy*, Lennie*, Lenny*, MacAldonich*, MacAlman*, MacAslan*, MacAslin*, MacAuselan*, MacAuslan*, MacAusland*, MacAuslane*, MacAlman*, MacAlmont*, MacAmmond*, MacAsland*, MacChruiter*, MacColman*, MacCormack*, MacCubbin*, MacCubbing*, MacCubin*, MacGeorge*, MacGibbon*, MacGreuisich*, MacGubbin*, MacInally*, MacIndeor*, MacIndoe*, MacKinlay*, MacKinley*, MacMaster*, MacMaurice*, MacMurchie*, MacMurchy*, MacNeur*, MacNuir*, MacNuyer*, MacQuattie*, MacWattie**, MacWherter, MacWhirter*, Masters*, Masterson*, MacCaslin*, Morrice*, Morris*, 
Morrison*, Murchie*, Murchison*, Richardson*, Risk*, Rusk*, Ruskin*, Spittal*, Spittel*, Walter*, Walters*, Wason*, Waters*, 
Watson*, Watt*, Watters*, Weir*, Yuill*, Yool*, Yule*, Youll*, Zuill*.
*Asterisked (*) sept names are sourced from 
Scots Kith & Kin. 1900. Edinburgh: Albyn Press, Ltd. for Clan House, Lindsay & Co. Ltd., 
s.d. (c1960, reprint of 1900 first edition). 94 pp. + fold-out map.