It has been claimed that Mariota Hay is the daughter of William Hay, Earl of Erroll, and his wife Beatrice Douglas, but evidence of relationship is not provided.
https://www.myheritage.com/names/mariota_hay
This proposition is not supported by the Scots Peerage account of the Earl's family which makes no mention of a daughter named Mariota.
https://archive.org/details/scotspeeragefoun03pauluoft/page/564/mod... The Scots Peerage III: 564-5
Can anyone provide evidence of relationship.