We have Alexander Donald m. Janet Largue with children:
John, bap. 08 08 1773 Old Deer ABD
James, bap. 15 10 1775 Old Deer ABD
James, bap. 05 10 1777 Old Deer ABD
Margaret, bap. 29 08 1779 Old Deer ABD
William, bap. 18 11 1781 Old Deer ABD
Robert, bap. 14 08 1784 Huntly ABD
John's baptism record notes he was born in Stuartfield, a town just south of Old Deer but within the parish:
https://maps.nls.uk/geo/explore/#zoom=16&lat=57.50553&lon=-2.04546&layers=5&b=1No witnesses were named. This is the earliest record I have found of Donalds in Old Deer.
William became a provision merchant, and m. 26 09 1840 Huntly, Helen McHardy. They lived in Deveron St. in Huntly in 1841. He died 26 06 1865 in Nelson St. in Huntly. His death record marks his father Alexander as a weaver.
I'd speculate that James (1777) is likely to be the Private James Donald, weaver born in Old Deer, who enlisted in the 92nd Gordon Highlanders aged 16 in 1794. He died 02 10 1799:
https://archive.org/details/territorialsoldi00bullrich/page/238/mode/2up?view=theater&q=donaldI also have it in my notes that a John Donald signed up to the 92nd in 1794 at Coynachie (parish of Gartly, south of Huntly), and that a lieutenant John Donald resigned from the 92nd in 1799. I can't find the original reference for that. Coynachie was part of the Gordon estate. The Duke of Gordon's Black Watch company of 1791 included a George and John Donald, brothers:
https://archive.org/details/territorialsoldi00bullrich/page/136/mode/2upWhether either of these John Donalds is the son of Alexander Donald and Janet Largue I do not know.
The Largue family appears to be from Inverkeithny but I cannot trace a marriage record for the pair.
I have not been able to find any mention of the surname Donald in the 1696 Poll Tax records for Huntly, nor any other mention of Donalds in Huntly before 1716.
If you have the time and patience, it might be useful to go through the (recently released, free-to-view) Kirk Session records for Huntly and/or Old Deer at Scotland's People, looking for any mention of the surname Donald. If you do this, please do let me know which pages you've been through and what you've found, so that we don't have to go through them ourselves!
Best wishes,
Iain.