When was the Barony of Kilmarnock ever up for sale? To my knowledge it has been a long held title by the recently deceased Cheif of Clan Boyd, Alastair Ivor Gilbert Boyd. 7th Baron Kilmarnock. At one point the Boyd name was hidden in the Hay clan, but as far as I know the title has always been held by a Boyd. The lands of Kilmarnock, and Kilmarnock Castle were granted to the Boyds by the Bruce for service in battle, and were forfieted only once after Cullodon, but were reinstated after a bit. The new Laird is Robin Boyd. Alastair's brother.