| Name | Role | Place | Source | |
|---|---|---|---|---|
| Elkan Isaak van Cleef | Registered | 1776 | Amsterdam | Notarial records |
| Isaak Bernardus van Cleef | Registered | 1895 | 's-Gravenhage | Notarial records |
| Isaak van Cleef | Registered | 1737 | Amsterdam | Notarial records |
| Isaak van Cleef | Groom | 1770 | Amsterdam | Register of notices of marriage |
| Isaak van Cleef | Partner | 1819 | 's-Gravenhage | Civil registration deaths |
| Isaak van Cleef | Partner | 1819 | 's-Gravenhage | Civil registration deaths |
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