D Campbell 8.2.1799 at King's / 26.10.1799 again / 29.12.1799 Campbells at Lanesborough's / 19.1.1800 again / 16.3.1800 mrs Campbell at King's / 4.4.1802 again
Perhaps Donald Campbell DNB 1751-1804 whose will PCC 1804 dated 5.5.1804 mentioned his reputed son William aged 2 or 3 years and Augusta Kendall, probably the mother. His legitimate son Frederick William is also in DNB 1782-1846 so could have been included in the plural Campbells as well as his mother Mary whose dates are not given in DNB
Boyles 1800 Duncan Campbell 3 Robert St Adelphi & Wilmington Mount nr Dartford Kent / Dugald Campbell Esq 18 Welbeck St / David Campbell clerk at Union hall 69 Redcross st, Southwark / David Campbell will PCC 1851 clerk in HM Customs Office of Stepney