| Isdall | James | | Volunteer from America (Irish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Israëls | J | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Ixel | Friedrich | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Jacobs | P | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Jacobsen | Peter Marius | | KIA 11/12/1899
Volunteer from Denmark serving with the Boer forces
Source: Hjaltarna vid Magersfontein, Kapten H E Uddgren, Sweden, 1924 | Scandinavian volunteers |
| Jacobsen | Peter Marius | | Died Magersfontein 11/12/1899
Volunteer from Denmark serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
| Jacobsohn | Leo | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Jacobson | Philip | | Volunteer from Russia (Jewish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Russian volunteers |
| Jacobson | Wolf | | Volunteer from Russia (Jewish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Russian volunteers |
| Jaekel | Bruno | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Jahan | L | | Volunteer from France serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | French volunteers |
| Jahard | Hubert | | Volunteer from France serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | French volunteers |
| Jahr | A | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Janek | Hjalmar Petterson | | WIA & POW 11/12/1899
Volunteer from Sweden serving with the Boer forces
Source: Hjaltarna vid Magersfontein, Kapten H E Uddgren, Sweden, 1924 | Scandinavian volunteers |
| Janek | Hjalmar Petterson | | Volunteer from Sweden serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
| Jankowsky | ? | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Jannasch | Hans | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Jansen | C | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Jansen | M G | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Jansen | R (P) A (H) | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
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