| Name | Role | Place | Source | |
|---|---|---|---|---|
| H Heikoop | Registered | 1848 | Breda | Population register |
| H. Heikoop | Travelers | 1957 | Rotterdam | Passenger registers |
| H. Heikoop | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| H. Heikoop | Travelers | 1957 | New York | Passenger registers |
| H. Heikoop | Travelers | 1960 | Passenger registers | |
| H. Heikoop | Travelers | 1953 | Rotterdam | Passenger registers |
| H. Heikoop | Travelers | 1960 | Passenger registers | |
| H. Heikoop | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
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