| Name | Role | Place | Source | |
|---|---|---|---|---|
| J.A. Helvert | Registered | 1890 | Vlijmen | Population register |
| J.A. van Helvert | Registered | 1890 | Hedikhuizen | Population register |
| J.A. van Helvert | Travelers | 1965 | Rotterdam | Passenger registers |
| J.A. van Helvert | Travelers | 1965 | New York | Passenger registers |
| J.A. van Helvert | Registered | 1883 | Hedikhuizen | Population register |
| J.A. van Helvert | Registered | 1857 | Vlijmen | Population register |
| Martinus J.A. van Helvert | Registered | 1905 | Vught | Population register |
| Martinus J.A. van Helvert | Registered | 1905 | Vught | Population register |
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