| Mercer | John | | | B Division
Source: QSA and KSA medal rolls | South African Constabulary |
| Mercer | R | | | Source: QSA and KSA medal rolls | 37th Battery, RFA |
| Mercer | R | | | 2nd Battalion
Source: QSA and KSA medal rolls | Northamptonshire Regiment |
| Mercer | R | | | 1st Battalion
Source: QSA and KSA medal rolls | Highland Light Infantry |
| Mercer | R | | | 1st Battalion
Source: QSA and KSA medal rolls | Loyal North Lancashire Regiment |
| Mercer | R | | | Source: QSA and KSA medal rolls | Loyal North Lancashire Regiment |
| Mercer | R | | | District 1
Source: QSA and KSA rolls | Cape Police |
| Mercer | R | 6238 | Private | 1st Battalion
Source: QSA roll | Loyal North Lancashire Regiment |
| Mercer | R | | | 1st Battalion
Source: QSA and KSA medal rolls | Scots Guards |
| Mercer | R | 65B/771 | Private | Frontier Wars. SAGS (1) 1879 | Connaught Rangers |
| Mercer | Richard | | | 1st Battalion
Source: QSA and KSA medal rolls | Scots Guards |
| Mercer | Robert | | | District 1
Source: QSA and KSA rolls | Cape Police |
| Mercer | T | | | 1st Battalion
Source: QSA and KSA medal rolls | King's Own Scottish Borderers |
| Mercer | T | 4937 | Private | Died of disease. Elandsfontein, 29 January 1901
Source: South African Field Force Casualty Roll | 2nd Dragoons (Royal Scots Greys) |
| Mercer | T | | | 1st Battalion
Source: QSA and KSA medal rolls | Loyal North Lancashire Regiment |
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