Wow ...
John Grierson married Janet Lockerbie 1804 in Lochmaben. He was the son of William Grierson.She the daughter of James Lockerbie and Grace Bell. The 1851 census shows members of the family living in Hightae . I thought they might be in the Lochmaben cemetery.
The Grierson name shows a variety of spellings ..Grirson , Grearson, Greerson so Grier would be possible. The same applies to Lockerbie , Lockerby etc.
So ... all possibilities are worthy of a look.
Thanks so much
Dorothy