N.N. Lennox

Not proven as a daughter of Malcolm, 5th Earl of Lennox. There is no record he had daughters.

Name seen as Helen Forrester, countess of Lennox.

https://www.wikitree.com/wiki/De_Atholia-9

Duncan was the son of Andrew de Atholia.[1][2] ...Duncan de Atholia, Earl of Athol from whom the Clan [Donnachaidh] takes its name. He was a great warrior, and a firm supporter of the cause of Robert Bruce. When a very aged man he fought, in company with his son Robert, at the battle of Durham against the English, 12th October, 1346.

He married a daughter of Callum Ruaidh Leamnach (the Gaelic name of Malcolm, 5th Earl of Lennox), [Disputed] by whom he had a son and successor, Robert.

Duncan de Atholia married, secondly, one of the co-heirs of Ewen de Insulis, Thane of Glentilt, by whom he had issue—Patrick, progenitor of the Robertsons of Lude, Thomas, and Gibbon. He had a Charter, dated December, 1355, from John, Bishop of Dunkeld— " Nobili viro Duncano, filio Andree de Atholia, et heredibus suis masculis terrarum de Adulia;" and dying soon afterwards was succeeded by his eldest son[3][4]

https://www.wikitree.com/wiki/Lennox-185

Given the lack of reliable sources to establish the identity of the alleged daughter of Malcolm, fifth earl of Lennox, Unknown Lennox has been detached from Malcolm's profile as his daughter. She can be reattached later if sources are found which verify such a relationship.

Sources

1. The Genealogy of the Families of Douglas of Mulderg and Robertson of Kindeace with their Descendants, A.M. Ross & Company, Dingwall 1895, p49 < Archive.Org >
2. The Peerage: Unknown Lennox. http://www.thepeerage.com/p56020.htm#i560194 “She brought Rannoch as her dowry”
3. Fraser, Alexander, "The Lennox", Edinburgh: private, 1874, Vol. I, Archive.org, pp. 240. < Archive.Org > No daughters listed.