| Name | Role | Place | Source | |
|---|---|---|---|---|
| Diderika W. Küpper | Registered | Dordrecht | Population register | |
| J. H. W. Kupper | Andere naam dan overledene | 1806 | Arnhem | Church records burials |
| W. Kupper | Travelers | 1969 | New York | Passenger registers |
| W. Kupper | Travelers | 1967 | Antwerpen | Passenger registers |
| W. Kupper | Travelers | 1967 | Antwerpen | Passenger registers |
| W. Kupper | Travelers | 1959 | Rotterdam | Passenger registers |
| W. Kupper | Travelers | 1969 | Rotterdam | Passenger registers |
| W. Kupper | Travelers | 1969 | Rotterdam | Passenger registers |
| W. Kupper | Travelers | 1969 | New York | Passenger registers |
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