| Name | Role | Place | Source | |
|---|---|---|---|---|
| Frederik Harm Koops | Witness | 1886 | Paramaribo | Civil registration deaths |
| Frederik Harm Koops | Witness | 1886 | Paramaribo | Civil registration births |
| Harm Frederik Koops | Mention | 1910 | Workum | Notarial records |
| Harm Frederik Koops | Mention | 1881 | Workum | Kohieren hoofdelijke omslag |
| Harm Frederik Koops | Mention | 1882 | Workum | Kohieren hoofdelijke omslag |
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