| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gerardus Hermanus Postma | Registered | 's-Gravenhage | Studbooks | |
| Gerardus Hermanus Postma | Registered | 1851 | Amsterdam | Population register |
| Gerardus Hermanus Postma | Registered | 1851 | Amsterdam | Population register |
| Gerardus Hermanus Postma | Loteling | 1871 | Sloten | Militia records |
| Gerardus Hermanus Postma | Person in notarial deed | 1871 | Hoorn | Notarial records |
| Gerardus Hermanus Postma | Registered | 1871 | Militia records |
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