| Name | Role | Place | Source | |
|---|---|---|---|---|
| Anna W. Proost | Registered | 1833 | Bergen op Zoom | Population register |
| Johanna W. Proost | Registered | 1844 | Bergen op Zoom | Population register |
| W. Proost | Registered | 1910 | Amsterdam | Passport applications |
| W. Proost | Mention | Correspondence | ||
| W. Proost | Registered | 1905 | Amsterdam | Family cards |
| W. Proost | Mention | Correspondence | ||
| W. Proost | Bruids zijde | 1745 | Groningen | Registrations before 1811 |
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