Salomon Polak was a son of Hijman Polak and Dina van Beek. He married in Amsterdam on 15 July 1937 Eva Stokvis, daughter of Joseph Stokvis and Rebecca Barend.
City Archive of Amsterdam, archive card of Hijman Polak and website www.wiewaswie.nl.
In addition, a Jokos file (number 1501) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.