Per
http://www.thepeerage.com/p47788.htm#i477875,
Cynthia Lindsay GRAHAM MENZIES (22 I 1936 - 19 II 2018) was the daughter of William Neil GRAHAM MENZIES (1903 - 27 VII 1945) and his wife (married 10 I 1933, as her first husband), Joan Noelle MURRAY (28 XII 1911 - 1989)
William Neil GRAHAM MENZIES was the third and youngest son of William Dudgeon GRAHAM MENZIES (25 XI 1857 - 24 X 1944) and his wife (married 28 VII 1890), Cecilia Clementina WOMBWELL (26 X 1864 - 20 I 1948), daughter of Sir George Orby WOMBWELL, 4th Bt (23 XI 1832 - 16 X 1913) and his wife (married 3 IX 1861), Lady Julia Sarah Alice CHILD-VILLIERS (1842 - 24 X 1921), the eldest daughter of the 6th Earl of Jersey
Joan Noelle MURRAY was a great-great-granddaughter of the 3rd Earl of Mansfield and a great-granddaughter of the 7th Earl of Denbigh/6th Earl of Desmond; her other noble descents can be explored on
thepeerage.com website.