| Hardtgen, Hermann Georg | Koch | 1853 | Bremen |
| Hardtgen, Johann Hinrich | Winters | 1855 | Bremen |
| Hardtgen, Johann Hinrich | Hardtgen | 1860 | Bremen |
| Hardtgen, Johann Jacob | Glimmann | 1820 | Bremen |
| Hardtgen, Johanna Margaretha Elisabeth | Glimmanns | 1824 | Bremen |
| Hardtgen, Johanne Sophie | Winters | 1844 | Bremen |