STRACHAN, John of Thornton ^{1 2 3}

   Other names for John were STRACHAN, John of Dillavaird ⁵ and STRATHAUCHIN, John of Dallivaird.¹

  General Notes:

(referring to David Strachan of Thornton)
"Being without issue, he in 1521 made a formal resignation of his estate in favour of his nephew Alexander, son of his younger brother John, reserving his own liferent, that of his wife, and of his brother John, and his wife Margaret Durham."

from Memorials of the Family of Strachan and Wise (1873)
"Lineage.-David Stuart, first of Inchbreck (1547), was son of Andrew Stuart, of Johnston, or Laurencekirk, in the
Mearns, and grandson of Sir James Stuart, of Athol, son of Murdoch, Duke of Albany, who was grandson of Robert II. King of Scotland. David m. Aegidia, dau. of John Strathauchin, of Dallivaird, and had one son, John Stuart, of Inchbreck..."

from A Genealogical and Heraldic History of Great Britain ⁴

  Research Notes:

DILLAVAIRD
(also Dullivard, Dallivaird)

"Alexander Strachan, Laird of Thorntoun, divided the lands of Thorntoun to his two sones, viz., Alex^r and John; Alex^r he got the lands of Thorntoun, and to John he gave the lands of Monboddo. Alex^r married Elizabeth, dau^r to the Lord Hay, and had succession an son named John, who succeeded to the lands of Thorntoun, and married Janet Ross, dau^r to the Laird of Auchloson in Marr, and begot on her an son called David Strachan, who married Margaret Hay, dau^r to the Laird of Dalgatie, arid had no succession; this David Strachan deceased, after whose decease John Strachan of Dillivaird succeeded, who married Eliz. Straton, daughter to the Laird of Lauriestoun, and begate on her an son named Alex^r. Alex^r, who married Katherine Erskine, daughter to the Laird of Dun, and begate on her a son named John, who married Margaret Livingston, dau^r to the Laird of Dunepace, and she had to him an son named Alexander, who married Eliz. Keith, daur to William, Earl Marischall."

from Memorials of the Families of Strachan and Wise (1877 Appendix)

Lay aside, if you will, the huge degree of difference presented by this Thornton genealogy, compared with what is generally accepted at present.
The point to be made here is that the title of "John Strachan of Dillivaird" is associated with John, David Strachan of Thornton's brother, through whom the Thornton succession continued. If Euphame Strachan was indeed this John Strachan's daughter, it would explain how it came into the Monboddo Strachan line. ⁵