Wilson Fairfax was an engineer for the Alexandria Canal Company.
Probate in Alexandria Wills, Book 1, page 268, will of Sarah Fairfax of the Parish of Malrot, County of Somerset, England, recorded in Alexandria December 15, 1813, mentions her brother Wilson Miles Carey Fairfax (as per Wesley Pippenger in volume 3, "Tombstone Inscriptions of Alexandria, Virginia," 1992).
"In memory of Our Father Wilson M.C. Fairfax who departed this life August 8, 1860 aged 61 years & 9 months."
The 1992 surveyor found the old style gravestone broken in several pieces; footstone "W.F." in trash pile.