Grand-quarterly 1^st and 4^th, 1^st and 4^th Gules a fess Ermine 2^nd and 3^rd Azure a chevron between three crosses pattée Or, 2^nd and 3^rd Gules a fess chequy Argent and Azure, in chief three mullets of the Second.

Sir John Crawfurd of Kilbirnie had no sons to inherit his estate. He had two daughters, the elder of whom, Anne, was already married to Sir Archibald Stewart of Blackhall. He therefore settled the inheritance on the husband of the second daughter, Margaret, who was the Hon. Patrick Lindsay the second son of John the Fourteenth Earl of Crawfurd and 1^st Earl of Lindsay, if they would accept the name and title and the Arms of Kilbirnie.

The couple died in 1680 within three days of each other of "A Malignant Fever", which, given the sanitary arrangements which prevailed in the castle at the time, could have been typhoid. Margaret, the elder sister, came to Kilbirnie to attend the funeral, caught the infection and also died.