| Duncan | W G | 865 | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Duncan | W G | | Corporal | Natal 1906 (1)
Source: Recipients of the Natal 1906 Medal | Durban Light Infantry |
| Duncan | W G | 445 | Private | Source: Nominal roll in WO127 | Durban Light Infantry |
| Duncan | W L | | | 1st Battalion
Source: WO100/281 | Grahamstown TG |
| Duncan | W M | | | Source: QSA and KSA medal rolls | Harrismith Volunteer Light Horse |
| Duncan | W N | | | Source: QSA and KSA medal rolls | Army Pay Department |
| Duncan | W O | | | 1st Battalion
Source: QSA and KSA medal rolls | Gordon Highlanders |
| Duncan | W T | | | 1st Battalion
Source: QSA and KSA medal rolls | Gordon Highlanders |
| Duncan | William | 38916 | Private | Served 06 Jan 02 to 27 Jun 02. Time Expired
Source: Nominal roll in WO127 | Cape Colony Cyclist Corps |
| Duncan | William | 29438 | Private | Source: QSA Medal Rolls | 20th Company, 6th Btn, IY |
| Duncan | William | 25 | | Occupation: Compositor. Next of kin: Wife. Address: Mossel Bay.
Source: Attestation paper in WO126 | Town Guard and District Mounted Troops |
| Duncan | William | 20581 | Private | Source: QSA Medal Rolls | 48th Company, 7th Btn, IY |
| Duncan | William | 37046 | Trooper | Served 31 May 01 to 03 Sep 02. Discharged Aldershot
Source: Nominal roll in WO127 | Scottish Horse |
| Duncan | William | | Bearer | Source: Nominal roll in WO127 | Natal Volunteer Ambulance Corps |
| Duncan | William | 428 | Trooper | Source: Nominal roll in WO127 | Rhodesia Regiment |
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