| Name | Role | Place | Source | |
|---|---|---|---|---|
| Isak Coster | Eerdere partner | 1773 | Rotterdam | Church records burials |
| Isak Coster | Loteling | 1867 | Leiden | |
| Isak Coster | Witness | 1749 | Rotterdam | Church records baptisms |
| Isak Elias Coster | Belanghebbende | 1811 | Notarial records | |
| Isak Elias Coster | Registered | 1824 | Utrecht | Population register |
| Isak de Coster | Buried | 1762 | Middelburg | Church records burials |
| Isak de Coster | Buried | 1762 | Middelburg | Church records burials |
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