[1] The ancient Mormaerdom and Earldom of Buchan came into the hands of the Clan Comyn, but they later lost it after they were defeated by Robert the Bruce.

[1] Sir Thomas's lands were around Edinburgh, and his seal includes an eight rayed figure which may represent the shining sun, which also forms part of the clan chief's crest.

[1] After Dundee was killed at the Battle of Killiecrankie in 1689 Buchan was appointed as commander-in-chief of all Jacobite forces in Scotland and received his commission from the king in Ireland.

[1] Buchan however escaped and joined forces with the Clan Farquharson who encouraged him to take the offensive again and they marched from Abergeldie to the Mearns.

[1] James Buchan, fourteenth of Auchmacoy, was recognised as chief of the name by Lord Lyon, King of Arms in April 1830.

[1] The Earl of Caithness's daughter, Lady Lucy Buchan married Sir Thomas Innes of Learney, who was the Lord Lyon in 1928.

During his Vietnam tour, a close friend, Major Peter Badcoe, was killed and subsequently posthumously awarded the Victoria Cross.

The clan has no official septs, but the following names have been linked to the Buchan region :[3] Basken/ Baskin, Bede, Buchan/ Bichan/ Bichen, Bonnieville, Boyne, Buck/ Buckie/ Bucky, Cawsell, Chapp, Chrystal, Chrystall, Clapperton, Coscrach/ Costie/ Costy, Cranach/ Crannach, Cruddon/ Cruden/ Crudon, Crystal/ Crystal/ Crystall, Fitchie/ Fitchy, Gammerie/ Gammery, Hardin/ Hardman/ Hardnan, Kermack, Leisk, Mac, Meason/ Merson, Mondie/ Mondy/ Mundie/ Mundy, Nible/ Niblo, Ogston/ Ogstone/ Ogstoun, Prince, Ratcliff/ Ratliff/ Rattcliff/ Rattliff, Runcie/ Runcy, Shakle, Tarves/ Tarvis, Teunion/ Teunon/ Tewnion/ Tinnon, Tucks, Wadsworth/ Wadsworther, West, Whammond/ Whyman/ Whymon, Willgook