| Siebert | J | | Trooper | BSACM Rhodesia 1896 (0).
Source: BSACM rolls | Matabeleland Relief Force |
| Siebert | J | 3501 | Private | Prisoner. Stormberg, 10 December 1899
2nd Battalion.
Source: South African Field Force Casualty Roll | Northumberland Fusiliers |
| Siebert | J | | | Source: WO100/252 | Imperial Military Railways |
| Siebert | J H | | | Source: WO100/285 | Swellendam TG |
| Siebert | Jacob Frederick | | | Prisoner number: 14085
Captured: Bethlehem 11 Sep 1900
Sent to: Unknown
Age: 28
Address: Bethlehem
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Siebert | Jacobus Johannes | | | Prisoner number: 24232
Captured: Aberfeldie 22 Sep 1901
Sent to: Unknown
Age: 30
Address: Vaalbank
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Siebert | James | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Siebert | Johannes George Christian | | | Prisoner number: 17650
Captured: Harrismith 27 Dec 1900
Sent to: Unknown
Age: 40
Address: Harrismith
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Siebert | John | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Siebert | Julius | | Trooper | BSACM Matabeleland 1893 (0).
Source: BSACM rolls | Salisbury Horse |
| Siebert | K | | Trooper | Frontier Wars. SAGS (1) 1877-8 | Stevenson's Horse |
| Siebert | L C | | Trooper | BSACM Rhodesia 1896 (0).
Source: BSACM rolls | British South Africa Police |
| Siebert | Louis Cornelius | | Trooper | Unit: C. troop. Nationality: Swedish. Missing in actiion, escaped.See Pitsani Account.
Source: List of Jameson raiders | Unknown |
| Siebert | M W | | Trooper | Frontier Wars. SAGS (1) 1877-8-9 | Cape Mounted Yeomanry |
| Siebert | Marthinus Albertus Philippus | | | Prisoner number: 17649
Captured: Harrismith 26 Dec 1900
Sent to: Unknown
Age: 25
Address: Harrismith
Source: Anglo Boer War Museum 2016 | Boer Forces |
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