Salomon Koekoek was a son of Mozes Koekoek and Lotje de Haan. When he married in 1899 to Jettje Kisch he was a schoolteacher of religion.
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In addition, a Jokos file (number 50103) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.