The 'name' Grierson originates from the Scottish lowlands. The ancient seat of the Griersons' is Lag, Civil Parish of Dunscore, Dumfriesshire, where Lag Tower was built in 1460 A.D. by Vedast Grierson.
The surname Grierson is a modern spelling of the medieval (circa 1408) surname Grerson. Ancestry.com states that it is a patronymic form of the medieval Scottish personal name Grier which is a form of the personal name Gregory, but provides no source for this.
The principal seat of the Grierson family was Lag, which was obtained in about 1408. George Dunbar, Earl of March resigned the lands of Dalgarnock in Dumfriesshire to Gilbert Grierson of Lag sometime before 1418. The earliest known family tree produced by James Campbell Gracie, (aka the "Gracie Tree" held in the Ewart Library, Dumfries), claimed a descent of the family of Lag from Malcolm II of Scotland.
It is believed by some Griersons that they are descended from the Clan MacGregor, however, the claim does not command any support from within Scotland itself and DNA studies have found no trace of MacGregor YDNA in any Grierson descendants tested. There is evidence that some MacGregors used the alias Grierson during their period of proscription, however the principal families first bearing the Grierson name have only ever been shown to originate from Galloway and the Nith Valley.
See also 
- Grierson (name)
- Grierson Baronets, of Lag
- Sir Robert Grierson, 1st Baronet (Auld Lagg)
- Sir William Grierson, 2nd Baronet
- Brigadier General Benjamin Grierson
- Dumfriesshire, Scotland
- Clan MacGregor
- Grierson's Raid
- Bannatyne Club: Registrum Honoris de Morton, Vol. I, Original Papers, p. 204, no. 216
- "Grierson Name Meaning and History". Ancestry.com. Retrieved 22 April 2008.; see also "Grier Name Meaning and History". Ancestry.com. Retrieved 22 April 2008.
- "Clan Grierson". Standing Council of Scottish Chiefs (clanchiefs.org). Retrieved 15 December 2010.
- The Lag Charters 1400-1720, No 3, Scottish Record Society
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