| Helkenberg, Carol. Helene | Casten | 1883 | Bremen |
| Helkenberg, Emilie Carol. E. | Casten | 1881 | Bremen |
| Helkenberg, Ernst | Casten | 1890 | Bremen |
| Helkenberg, Friedr. | Casten | 1876 | Bremen |
| Helkenberg, Heinr. Wilh. E. | Casten | 1878 | Bremen |
| Helkenberg, Wilh. Christ. Gg. | Castens | 1880 | Bremen |