| Name | Role | Place | Source | |
|---|---|---|---|---|
| Florent Frans Jacob Jan de Beukelaer | Registered | 1906 | Ossendrecht | Population register |
| Jacob Beukelaer | Child | 1626 | Warmond | |
| Jacob Pieters Beukelaer | Registered | 1691 | Amsterdam | Notarial records |
| Jacob Pietersz Beukelaer | Registered | 1694 | Amsterdam | Church records burials |
| Jacob Pietersz Beukelaer | Groom | 1694 | Amsterdam | Register of notices of marriage |
| Jacob de Beukelaer | Registered | 1900 | Gruiten | Population register |
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