| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jacob Merkel | Witness | 1793 | Amsterdam | Church records baptisms |
| Jacob Merkel | Registered | 1752 | Amsterdam | Notarial records |
| Jacob Merkel | Registered | 1770 | Amsterdam | Notarial records |
| Jacob Merkel | Groom | 1783 | Amsterdam | Register of notices of marriage |
| Jacob Merkel | Registered | 1744 | Amsterdam | Notarial records |
| Jacob Merkel | Military | Studbooks | ||
| Johan Jacob Merkel | Father | 1755 | Leeuwarden | Church records baptisms |
| Johan Jacob Merkel | Witness | 1776 | Amsterdam | Church records baptisms |
| Johan Jacob Merkel | Witness | 1776 | Amsterdam | Church records baptisms |
| Johan Jacob Merkel | Lidmaat | Leeuwarden | DTB Lidmaten |
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