| Name | Role | Place | Source | |
|---|---|---|---|---|
| Japijk | Registered | 1731 | Amsterdam | Notarial records |
| Japijk Driesken | Father | 1627 | Grave | Church records baptisms |
| Japijk Knoons | Father | 1762 | Rotterdam | Church records baptisms |
| Japijk Rodenhoek | Deceased | 1780 | Workum | Church records burials |
| Japijk Rodenhoek | Deceased | 1780 | Workum | Church records burials |
| Japijk Verduijn | Witness | 1729 | Rotterdam | Church records baptisms |
| Japijk de Graaff | Baptized | 1752 | Willemstad | Church records baptisms |
| Japijk de Graaft | Child | 1752 | Willemstad | Church records baptisms |
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