Looks two families had it !!

ALLARDICE OF NEW DUNNOTTAR
ALEXANDER ALLARDICE Esq. Of New Dunnottar, Mearns, made his fortune abroad and on his return to his native country he purchased the estate of Dunnottar. He left an only daughter and heiress, Eleanor Allardice who married, 1st May 1814, the Hon Archibald Lord Kennedy (died Earl of Cassilis 12th August 1832) and by her (who died 23rd November 1832) he left issue nine sons and one daughter. The Countess of Cassilis lived to see her patrimonial estate alienated to General Nathaniel Forbes of Auchenrach.
ARMS - Argent, a fesse wavy, gules between the three boars' heads couped, sable.
CREST - A demi-savage, a-frontee, wreathed, holding in his dexter hand a scimiter, proper. MOTTO -In defence of the distressed.
CHIEF SEAT - was Dunnottar House, a fine mansion closely embowered amid finely wooded and extensive grounds and gardens about a quarter of a mile west of Stonehaven.
http://www.allerdice.net/Documents/Allardice%20History%20Cowie1.htm