| Name | Role | Place | Source | |
|---|---|---|---|---|
| J Joncker | Registered | 1717 | Amsterdam | Notarial records |
| J. Joncker | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| Jacob J. Joncker | Bruidegoms zijde | 1788 | Kerkelijke gemeente Winschoten | Registrations before 1811 |
| Jan J Joncker | Father | 1671 | Hoorn | Church records baptisms |
| Jan J Joncker | Father | 1671 | Abbekerk | Church records baptisms |
| Joncker J. van Hersbeke | Witness | 1607 | Steenbergen | Church records baptisms |
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